I personally only ever got a 3cx working with an Edgemarc etc and would point the PBX at the Edgemarc etc *Thanks?* Zak Rupas | Tier 3 Engineer *From:* voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] *On Behalf Of *PE *Sent:* Tuesday, September 25, 2012 3:28 PM *To:* voiceops at voiceops.org *Subject:* [VoiceOps] Broadsoft / 3CX SIP Trunks Greetings fellow voipsters, Have any of you done a SIP trunk integration between Broadsoft and 3CX? Or, more specifically, I have a customer with a 3CX device (don't ask) that is registered and I can send an INVITE, but their end denies the call (sends a 480 Temporarily Unavailable response) because it is having trouble routing it to the destination in the 3CX system. This is because they are expecting only the extension (4-digits), which I can send in the To: header but the SIP URI is the full, registered User ID so that the SBC knows how to get it to them. They are expecting only 4 digits in both the INVITE URI header and the To header. I know I can create a complex/convoluted header manipulation with the SBC but it just feels like there must be another way. Anyone know how to config the 3CX -- or even have a decent workaround -- to support this? Thanks