Got an inbound sip trunk from Asterisk (yeuck) to uc520 (no config needed on uc520 - inbound sip only). Both devices are on same local subnet.
Calls from * to uc520 work fine until an ext. on uc520 is busy or not answered.
When call goes to Unity - caller (at * end) can hear voicemail message and DTMF tone work but no audio is recorded.
I'm guessing it's an access list problem when * talking to unity - but not sure where to look.