i wanted to check if anyone could recommend a phone system that is compatible with polycom 550s and 330s. my company bought an asterisk based system and we have been having issues with echo and noise on outgoing/incoming calls. we use voip internally and the sound quality is pristine but our outbound calls go over a PRI and the sound quality (echo, static, hissing, etc) is not at all what we were expecting.

we went with a voip system to benefit from networking our 5 branches together and they ability to do screen pops from our crm application.

the vendor is willing to take back the pbx but we would be stuck with the phones. can someone recommend another non-asterisk based phone system that will work with the polycom sip phones.