[cisco-voip] SIP Trunk to Paetec ITSP

[tednugent73 at gmail.com]

Uggh.. This keeps getting better the more I dig into it... they're running  
CM4.2 which I know requires a hardware based MTP to pull DTMF out of band,  
however other than that and the potential port issues on the firewall what  
are the implications of running an ITSP trunk on 4.x? I've always thought  
of SIP trunking (SIP anything) pre-5.x as a novelty at best… Are there any  
features/functionality that might be missing and/or should I pressure them  
to upgrade to CM6.x+ beforehand (not even sure if that's an option at this  
stage in the game)? I'm loading up the SRND as we speak but any real world  
feedback is greatly welcome. Thanks Matt and Paul for your responses!
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