Recently I saw that Integra is one of the top MITEL partners in the US. Now I see that Frontier is deploying MITEL at Illinois Wesleyan University in a hybridsolution of analog and VoIP. It seems to me that MITEL has a strong sales force in the Midwest with Frontier and Integra.
Frontier's Anywhere cloud comm service is powered by MITEL. Frontier will sell this nationwide - not just in-region.
MITEL seems to have picked good partners -- companies that will do more than just add them to a wide portfolio of services, but rather partners who will go-to-market with them in a big way. Others should be so lucky.