Here is the SIP trace that I am getting.
1861579mS SIP Tx: UDP 10.0.0.4:5060 -> 192.76.120.10:5060
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.76.120.10;branch=z9hG4bKb9a1.e0242230673fff0ed510ba6308276a67.0
Via: SIP/2.0/UDP 10.15.0.34:5082;received=10.15.0.34;rport=5082;branch=z9hG4bKc3aS1F0v116rN
Record-Route: <sip:192.76.120.10;r2=on;lr;ftag=K6ZmQvmBHB8Nj>
Record-Route: <sip:10.15.0.36;r2=on;lr;ftag=K6ZmQvmBHB8Nj>
From: "ACCENT COMMUNIC" <sip:6122306801@sip.telnyx.com>;tag=K6ZmQvmBHB8Nj
Call-ID: 8a07451f-aa9c-1235-288b-02424010f852
CSeq: 106570693 INVITE
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,INFO,NOTIFY,UPDATE
Supported: timer
Server: IP Office 9.1.7.0 build 163
To: <sip:16122303877@63.156.193.146:5060>;tag=313a36e6e6b2791a
Content-Length: 0
1861580mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) INVITE Received ep 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f1850248), dialog f184e99c
1861580mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) LR is On and route is Route: <sip:192.76.120.10;r2=on;lr;ftag=K6ZmQvmBHB8Nj>
1861580mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) LR is On and route is Route: <sip:10.15.0.36;r2=on;lr;ftag=K6ZmQvmBHB8Nj>
1861580mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) UpdateSIPCallState SIPDialog::INITIAL(0) -> SIPDialog::INVITE_RCVD(9)
1861581mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) UpdateSDPState SIPDialog::IDLE(0) -> SIPDialog::OFFER_RCVD(2)
1861581mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SdpClone
1861581mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SIPDialog::BuildFastStartFromSDPOffer sdpmsg f56462c4
1861581mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SIPDialog::FindConnectionParameters: found media proto <RTP/AVP>
1861581mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SetRfc2833TxPayload: use RFC2833 for dtmf
1861582mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SetRfc2833TxPayload: payload 101 set_rx 1
1861582mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SIPDialog::BuildFastStartFromAudioMediaSDPOffer reinvite 0 msg f559b1b0 fs in msg 1 mRTP_PType 255
1861582mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SetRemoteRTPAddress to 64.16.248.82:31184
1861583mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) Process SIP request dialog f184e99c, method INVITE in state SIPDialog::INVITE_RCVD(9)
1861584mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) UpdateClone mMesg f1852700 smsg f184a674
1861584mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) CMSetup forwarded to call model owner_ep 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f1850248), dialog f184e99c has sdp 1
1861589mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f1850248) received CMReleaseComp
1861589mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) Terminating dialog f184e99c, state SIPDialog::INVITE_RCVD(9) for cause CMCauseNoChannel
1861589mS Sip: SIPDialog::ExtractResponseParamsFromViaHeader remote sent_by: 192.76.120.10 trunk
1861589mS Sip: SIPDialog::ExtractResponseParamsFromViaHeader remote sent by transport: SIP/2.0/UDP trunk
1861589mS Sip: SIPTrunkEndpointDialogOwner::SetRemoteAddressForResponse from 192.76.120.10:5060 to 192.76.120.10:5060
1861590mS Sip: 0a0000040000041a 17.1050.1 -1 SIPTrunk Endpoint(f184e99c) SendSIPResponse: INVITE code 480 SENT TO 192.76.120.10 5060
1861591mS SIP Call Tx: 17
SIP/2.0 480 Temporarily Unavailable
Via: SIP/2.0/UDP 192.76.120.10;branch=z9hG4bKb9a1.e0242230673fff0ed510ba6308276a67.0
Via: SIP/2.0/UDP 10.15.0.34:5082;received=10.15.0.34;rport=5082;branch=z9hG4bKc3aS1F0v116rN
Record-Route: <sip:192.76.120.10;r2=on;lr;ftag=K6ZmQvmBHB8Nj>
Record-Route: <sip:10.15.0.36;r2=on;lr;ftag=K6ZmQvmBHB8Nj>
From: "ACCENT COMMUNIC" <sip:6122306801@sip.telnyx.com>;tag=K6ZmQvmBHB8Nj
Call-ID: 8a07451f-aa9c-1235-288b-02424010f852
CSeq: 106570693 INVITE
Allow: INVITE,ACK,CANCEL,OPTIONS,BYE,INFO,NOTIFY,UPDATE
Supported: timer
Server: IP Office 9.1.7.0 build 163
Reason: Q.850;cause=34;text="No circuit/channel available"
To: <sip:16122303877@63.156.193.146:5060>;tag=313a36e6e6b2791a
Content-Length: 0
It is very odd... Calls to a phone work fine, twinning works perfect, I just can't get voicemail to pick up.