March 2008 Archives

This week, the Federal Communications Commission (FCC) released new data on high-speed connections to the internet in the United States. Twice a year, all facilities-based broadband providers are required to report to the Commission basic information about their service offerings and types of customers pursuant to the FCC’s local telephone competition and broadband data gathering program (FCC Form 477). Statistics released this week reflect data as of June 30, 2007.
 
High-Speed Lines – 200+ KPBS Asymmetrical Communications
 
                     High-speed lines increased by 22% during the first half of 2007, from 82.8 million to 100.9 million lines in service, following a 27% increase, from 65.3 million to 82.8 million lines, during the second half of 2006. For the full twelve-month period ending June 30, 2007, high-speed lines increased by 55% from 65.3 million to 100.9 million (or 35.7 million lines) compared to a 54% increase, from 42.5 million to 65.3 million lines (or 22.8 million lines), in the twelve-month period ending June 30, 2006.  
 
                     Of the 100.9 million total high-speed lines reported as of June 30, 2007, 65.9 million served primarily residential end users. Cable modem service represented 50.6% of these lines while 37.5% were asymmetric DSL (ADSL) connections, 0.2% were symmetric DSL (SDSL) or traditional wireline connections, 1.7% were fiber connections to the end user premises, and 10.0% used other types of technology including satellite, terrestrial fixed or mobile wireless (on a licensed or unlicensed basis), and electric power line. 
 
                     High-speed ADSL increased by 2.1 million lines during the first half of 2007, fiber connections increased by 0.4 million lines, and cable modem service increased by 2.4 million lines. For the full twelve-month period ending June 30, 2007, ADSL increased by 4.9 million lines, fiber connections increased by 0.7 million lines, and cable modem service increased by 5.2 million lines.
 
Advanced Services Lines – 200 KBPS+ Symmetrical Communications
 
                     Advanced services lines, which deliver services at speeds exceeding 200 kbps in both directions, increased by 16% during the first half of 2007, from 59.8 million to 69.6 million lines, compared to a 17% increase, from 51.1 million to 59.8 million lines, during the second half of 2006. For the full twelve-month period ending June 30, 2007, advanced services lines increased 36% from 51.1 million to 69.6 million (or 18.5 million lines). 
 
                     Of the 69.6 million advanced services lines reported as of June 30, 2007, 59.8% were at least 2.5 mbps in the faster direction and 40.2% were slower than 2.5 mbps in the faster direction.
 
                     Of the 69.6 million advanced services lines, 61.1 million served primarily residential end users. This means that 8.5 million advanced service lines are provided to businesses and others.  Cable modem service represented 53.9% of these lines while 34.1% were ADSL connections, 0.2% were SDSL or traditional wireline connections, 1.9% were fiber connections to the end user premises, and 10.0% used other types of technology including satellite, terrestrial fixed or mobile wireless (on a licensed or unlicensed basis), and electric power line.
 
In doing your analysis of these figures, note that for FCC reporting purposes, high-speed lines encompass advanced services lines. High-speed lines are connections that deliver services at speeds exceeding 200 kilobits per second (kbps) in at least one direction, while advanced services lines are connections that deliver services at speeds exceeding 200 kbps in both directions.   The report can also be downloaded from the Wireline Competition Bureau Statistical Reports internet site at www.fcc.gov/wcb/stats. 
TECHtionary.com today announced significant solutions coming from SIP technology and made part of its SIP Essentials and Microsoft OCS-Office Communications courses. SIP portends to be the most significant solution to business communications since “sliced bread.” In a rapidly sinking economic climate, SIP may be just the sauce that even the Fed Reserve would use to bring about solvency. Here are the Top-10 significant solutions to select SIP today:
1 – Soaring maintenance costs can be . .
2 - Significant operating costs are mitigated by . .
3 – Simplified management brings about . .
4 – Simple network configurations solves . . .
5 – Straightforward network design proves to . . .
6 – Slimmed billing consolidates …
7 – Swamped staff can consider . . .
8 – Sizeable overall savings result from . .
9 – Substantial business opportunities are realized by …
10 – Stateful security from . . .
 
All these are SIP solutions are explained in detail in OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. Join and support SIP Forum activities at www.sipforum.org.

IAS Morphs into SIP Trunking

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One of the many types of SIP Trunking will be using current IAS-Integrated Access Service also known as CAS-Converged Access Service to support SIP signaling. That is, the provider SBC-Session Border Controller would act as a SIP Proxy server to support SIP UAC-User Agent Client devices, Microsoft OCS-Office Communications Server, softphone clients, analog and other signaling protocols such as FAX and T.38 FAX. QoS is also supported in the LAN via 802.1p/q and on the WAN DSCP-Differentiated Services Code Points or separate MPLS-Multi-Protocol Label Switching. In addition, SIP trunking will be offered via metro/gigabit ethernet. Among the many providers of this technology is Nortel with the CS2100.
 
If you want to know more, this information is also part of OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. 
Here's a few more words on optimizing bandwidth for performance and QoS. This chart represents approximate bandwidth requirements using various voice compression CODECs and data network topologies. In planning any VoIP/SIP network, bandwidth capacity planning is critical. The most common mistake is to simply do "busy hour" study of the number of voice calls and compare against a Poisson/Erlang chart and divide by the bandwidth. Worse yet, in some cases planners simply think they can add voice calls to an existing data network.   Data networks are often configured for asymmetrical communications - higher downstream than upstream data speeds. Traditional telephony is called "narrowband" because it supports (or passes audio signals only in the range of 300-3500 Hz (passband), a bandwidth of just 3.2 kHz. G.722.1 (also known as Siren) provides 7 kHz of audio bandwidth (50-7000 Hz) known as wideband audio.
 
An indepth knowledge of network issues is important as OCS supports UDP, TCP and G.711 which may have an impact on other VoIP/SIP connections. In addition, cable modem and DSL-Digital Subscriber Line services provide are asymmetrical (higher data rates for downstream than upstream) data services. The asymmetrical nature of these network services is often why VoIP does not perform well when used with symmetrical voice services. In addition, data services are generally "bursty" (large volumes at one time like when everyone checks their email in the morning or at lunch) or "chunky" (large database, video or multimedia downloads). The most important point is that in planning for SIP implementations allocate 80-100 KBPS per call for G.711 and around 30 KBPS per call for G.729. That is, while G.711 provides for 64KBPS of voice it needs more bandwidth because of the packetizing (overhead) for an internet protocol network. Here’s an easy rule of thumb, for G.711 take the total number of simultaneous (concurrent) calls times 100 KBPS and that is the bandwidth the customer needs for peak times. This means careful initial and long-term planning is critical to achieving and maintaining MOS 4.0 or higher in VoIP/SIP networks. A new concept called "wide" digits recommends that packet intervals should be at least 100ms or more.
 
If you want to know more, this information is also part of OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. 
This tutorial reviews CA-Certificate Authority responsible for issuing, distributing and revoking certificates. PKI-Public Key Infrastructure is a two-key asymmetric system. Messages are encrypted with a public key and decrypted with a private key. Symmetric (private) key systems use one key for en/decryption. While implementations are not necessarily compatible, the main purpose of PKI is to provide interoperability across vendors, systems and networks. Both public and private CAs exist. 
 
The tutorial explains the details of digital certificates. Here are the highlights:
- Inside a X.509 certificate (example only) The CSP-Certificate Statement Practice is the document which determines the contents of the certificate. Certificate revocation is the process of terminating a certificate before it expires. The owner of the certificate can revoke a certificate at anytime via OCSP-Online Certificate Status Protocol or the CRL-Certification Revocation List which is updated hourly, daily, etc and is distributed to the PKI-Public Key Infrastructure.
- RA-Registration Authority - off-loads from CA - accepts registrations, distributes keys, validates identities
- LRA-Local RA - establishes identity of individual
- Four types of Trust Models in PKI-Public Key Infrastructure:
- Hierarchical
- Bridge
- Hybrid
- Mesh
Office Communications Server can be deployed with many components installed on the same physical server in smaller environments where few servers are required, or it can be scaled out. Communications between federated organizations are encrypted and identity verified using certificates. When communications are occurring between two organizations deploying Office Communications Server, these communications are encrypted end-to-end. Two of the common troubleshooting CA issues are:
- Missing or incorrect parameters (SN/SAN)
- Certificate chain/root certificate missing
If you want to know more, this information is also part of OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. 
 
I was a speaker this week at Channel Partners on Microsoft OCS-Office Communications Server and SIP which was followed by a session on SIP Trunking. Surprisingly or maybe not, the panelists explained incorrectly the two major types of CODECS.  So, here’s a technical tutorial on CODECs Digital Signal Processors. That is, if you sell VoIP/SIP you should know when/why to use each CODEC type and what high or low performance you will get when you do. If you buy/implement it, you should know what happens when you get DSP-Digital Signal Processing delays arising from "asynchronous transcoding." 
A CODEC-COder-DECoder (also known as an encoder-decoder and COmpression-DECompression system when used in video systems) is a computer chip (semiconductor) DSP-Digital Signal Processing system. Source codecs are designed specifically for speech, whereas Waveform codecs work well with any type of sound. Depending on the audio or voice application would drive the selection of the Source or Waveform CODEC. While there are many types of CODECs, G.711 (wave form) & G.729 (source form) are the two most-commonly CODECs used in VoIP systems. There are many other types of CODECs used in special applications such as Polycom’s SIREN and RT-A-Real-Time Audio used in Microsoft’s OCS-Office Communications Server.
 
Shown here is a G.711 encoded audio stream is 64/56/48 KBPS-Kilo Bits Per Second. Each 13/14 bit sample of the original signal (voice-audio) is encoded into an eight bit Byte/Octet.   Compression algorithms operate by sampling voice and quantizing the analog sound into digital values. G.711 is based on traditional Nyquist-Shannon sampling theorem that the sampling frequency rate must be at least twice as high as the highest input frequency for the result to closely resemble the original signal. A 4,000 Hz-Hertz voice pattern would be sampled at a rate of 8,000 BPS-Bits Per Second.  
 
Here's the "so what" or "why should I care about this." For example, different CODEC sampling rates may start synchronized but shortly become un-synchronized which can cause encoding problems and voice to jitter. To measure and manage jitter RTP-Real Time Protocol uses the time-stamp function in the protocol to assess jitter based on the delay between arrival (interarrival) times of each packet. Changing the number of bits sampled and quantized can dramatically impact the voice quality.  However, LAN-Local Area Network and WAN-Wide Area Network bandwidth limitations may have an equal or greater impact on VoIP performance. Echo can also occur as a result of Asynchronous Transcoding. Transcoding is the process of conversion between circuit-switched (PSTN-Public Switched Telephone Network) and packet-switched networks such as Frame Relay, IP-Internet Protocol and ATM-Asynchronous Transfer Mode. The point is that Asynchronous Transcoding should be avoided. According to Intel, "The term "asynchronous transcoding" refers to a situation when, for example, one endpoint is talking G.711 to another endpoint talking G.729 or two different encodings)."  The point is that Asynchronous Transcoding should be avoided and if you ignore this issue, your calls may certainly be in peril.
 
Next time – tutorial on bandwidth required for telephone calls in SIP/VOIP.
 
This information is also part of OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. For a complete detailed course outline go to: http://www.techtionary.com/ocs/sip-essentials.htm
 
I love my iPhone but I am only a multi-national corporate wannabe.  In my conversations with other iPhone lovers who work in the enterprise space, they also love the iPhone but are often blocked by corporate IT security and Exchange developers from using their iPhones for business.  In some cases, users forward their corporate emails to a gmail, yahoo or non-corporate email account to get email on their iPhone.  Now with support for Microsoft Exchange Server 2003 or 2007, iPhone 2.0 software will allow users to wirelessly push company email, calendar events, and contacts over Wi-Fi or EDGE networks to iPhones. This also means that SIP “presence,” IM, and other SIP/OCS applications are on also their way.   This new development will only serve to increase demand and interest in the iPhone.  
We at TECHtionary develop Flash/Quicktime sales and technical training tutorials for the iPod/Touch/Phone because the iPhone combines all the functionality of unified communications in one device.  Our sales tutorials are used by sales people to get “up-to-the minute” sales tips, product updates and price changes on one device.  In you want an example of an iPhone tutorial, send me an email cross@gocross.com
Combining the next-generation of Microsoft OCS-Office Communications Server features will also serve to increase demand for the iPhone.  To get specific, Apple says “upcoming iPhone support for Microsoft Exchange ActiveSync and industry-standard corporate security standards will allow IT professionals to seamlessly integrate iPhone into their enterprise environments.” New features include:
-                 Push email
-                Push contacts
-                Push calendar
-                 Global Address List
-                 Certificates and Identities
-                WPA2/802.1x
-                Enforced security policies
-                More VPN-Virtual Private Network protocols
-                Device configuration
-                Remote wipe
Note these are features that are just coming out today.  In my view and with the surge in new iPhone applications coming from developers, the iPhone will be, in my opinion, the “quintessential” communications platform, not just device. The device will continue to evolve but the platform is even more powerful.
 
This information is also part of OCS-101 and SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. For a complete detailed course outline go to: http://www.techtionary.com/ocs/sip-essentials.htm
 
Maybe the coolest part of the new Apple iPhone is not the SDK-Software Developers Kit or the enterprise support for but is the fact that a leading venture capital company KPCB-Kleiner Perkins Caufield & Byers has created the iFund to fund iPhone products.
 
KPCB’s iFund is a $100M investment initiative that will fund market-changing ideas and products that extend the revolutionary new iPhone and iPod touch platform.  According the Apple, The iFund is agnostic to size and stage of investment and will invest in companies building applications, services and components. Focus areas include location based services, social networking, mCommerce (including advertising and payments), communication, and entertainment. The iFund will back innovators pursuing transformative, high-impact ideas with an eye towards building independent durable companies atop the iPhone / iPod touch platform.” 
 
The real “take-away” is not the money but that Apple is also committed to marketing these new products.  Apple the preeminent marketing company has taken the iPhone from zero to millions in an exceptionally short time.  When Asia and then the rest of the planet can get their hands on an iPhone, it will undoubtedly be the most profound device ever-invented.  Recently I had an executive from Chile who was in my OCS-SIP class who had an iPhone even though the iPhone is not available in Chile.  He said he bought a kit from one of the sources mentioned in http://www.ipodhacks.com/ and he was good-to-go.  Another example of give people something really great and they will go to the trouble to get it to work.  
Now is the time to get going and build the next generation of “killer applications.”  For more go here: http://developer.apple.com/iphone/program/
 

SIP Forum - Join and Support

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I writing to encourage your support of the SIP Forum.  I will be providing additional information, however, in the meantime, go to http:www.sipforum.org and get involved today.

The SIP Forum is an industry organization with members from the leading IP communications companies. Its mission: To advance the adoption of products and services based on SIP.

The Forum promotes SIP as the technology of choice for the control of real-time multimedia communication sessions throughout the Internet, corporate networks, and wireless networks.

The Forum directs technical activities aimed at achieving high levels of product interoperability, provides information on the benefits and capabilities of SIP, and highlights successful applications and deployments.

 

IM is certainly one of the most popular applications in use today. With Microsoft Office® OCS, IM can be extended enterprise-to-enterprise securely and safely via Federations. OCS-Office Communications Server supports both 1-1 and 1-X messaging internally and Federation IM-Instant Messaging. With one-to-one instant messaging, two users can exchange IM-instant messages. With I-X-group instant messaging, three or more users can exchange instant messages. Federation IM is IM allows communications of IM, exchange notification and presence (SIP) with users of another organization. OCS extends “presence” throughout the Federation and other applications, reducing "info lag" (office jet lag) finding the right person, dialing the right number and using the right communication (audio, video, animation, group) in the right context (1-1, 1-X, X-1, X-X) at the right time (real-time, shifted, archived). 
Even though there are considerable security and compliance risks associated with IM its growth company-to-company is growing significantly even though many users use consumer-grade IM applications. SPIM-SPam over IM and other vulnerabilities are also  protected through via OCS. OCS also offers an increasing series of developer tools and API-Applications Programming Interfaces to provide enhanced SIP presence controls. Voice will treated like data elements like data in a database with multi-media presence components accelerating voice-enabled business processes. 
Bottom-Line - "Strategically, the faster you can communicate, the faster you can change, and those corporations that change the fastest will be the most successful."
Thomas B. Cross
 
Looking “inside” OCS-IM - “Parts” to Rich Presence - Categories, Containers and Watchers
Here are the key elements in OCS-IM:
- Categories
     - Decompose the presence document into smaller pieces (“categories)
     - Identifies type of data being published
     - Collection of data elements {Category name, value} – based on pre-agreed XML schema
- Containers – Membership Lists
     - Combination of publications and watchers– different watchers get different categories such as personal, team, workplace, public
     - Membership definition (ACLs-Access Control Lists)
     - Watchers assigned to one or more containers
Allow multiple instances of categories to be published for different containers
- Watchers
     - Watchers receive notification of any category instance published to their container
Apply ACL-Access Control Lists in many ways:
- URI List (per user)
- Same Enterprise
- Domain List
- Federated Users
- Public Cloud Users
- Clients free to connect without server handshaking
 
This presentation is part of SIP Essentials 2.0c available in the onsite and online courses. The online version is $299 for SIP 2.0c and for $499 as part of OCS-101 Office Communications Server online version per person or less with discounts. For more information go to http://www.techtionary.com or please call Tom Cross at 303-594-1694 or cross@gocross.com Discounts are also available to members of the SIP Forum. For a complete detailed course outline go to: http://www.techtionary.com/ocs/sip-essentials.htm

 

IM is more than just one-to-one messaging. For example, MSRP-Message Session Relay Protocol defines a mechanism for sending instant messages within a peer-to-peer session, negotiated using the SIP and SDP-Session Description Protocol. Here is an explanation of the necessary tools for establishing multi-party IM sessions or chat rooms (like the original BBS-Bulletin Board Systems) with MSRP.
 
This animated tutorial above also explains - SIMPLE-SIP for Instant Messaging and Presence Leveraging Extensions - a working group that focuses on the application of the Session Initiation Protocol (SIP, RFC 3261) to the suite of services collectively known as IMP-Instant Messaging and Presence. The IETF has committed to producing an interoperable standard for these services compliant to the requirements for IM outlined in RFC 2779 (including the security and privacy requirements there) and in the CPIM-Common Profile for Instant Messaging specification, developed within the IMPP working group. As the most common services for which SIP is used share information in common with IMP, the adaptation of SIP to IMP seems a natural choice given the widespread support for current state of the SIP standard.
 
"A" builds an instant text message and wraps it in a CPIM-Common Profile for Instant Messaging message. "A" addresses the CPIM message to the chat room. "A" encloses the result in an MSRP-Message Session Relay Protocol SEND request and sends it to the MSRP mixer via the existing TCP-Transmission Control Protocol connection. This depicts a flow diagram where "A" is sending a private message addressed to "B's" nickname. The MSRP mixer distributes the message only to "B." "B" can distinguish the sender in the From header of the CPIM message. "B" also identifies this as a private message due to the to the CPIM header. 

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