I've followed the guide by 2N Helios to configure the UC320 with their door phone. The door phone acts as a SIP Trunk.
It says to test press the door phone button outside and it should ring the phones.
Then to test a call to the door phone by dialing the door phones extension.
So I dial 500 from Cisco SPA525G IP Phone and it says connected but I hear no audio.
If I press the door phone button it doesn't ring the phones.
The Cisco UC320 Status Page shows the SIP Trunk as registered.
This is a log from the UC320 as I try to dial 500 to talk to the door phone.
Sep 10 15:45:00 UC320W user.debug voice: INVITE sip:00@192.168.0.190 SIP/2.0
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-75c6cae6
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 101 INVITE
Max-Forwards: 70
Contact: "FrontDoor" <sip:500@10.1.1.16:5060;ref=500>
Expires: 240
User-Agent: Cisco/UC320W-2.3.3(4)
Allow-Events: talk, hold, conference, x-spa-cti
Content-Length: 302
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: x-sipura, replaces
Content-Type: application/sdp
v=0
o=- 116012 116012 IN IP4 10.1.1.16
s=-
c=IN IP4 10.1.1.16
t=0 0
m=audio 16456 RTP/AVP 0 2 8 9 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:2 G726-32/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:9 G722/8000
a=rtpmap:18 G729a/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:30
a=sendrecv
Sep 10 15:45:00 UC320W user.debug voice: SIP/2.0 100 Trying
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-75c6cae6;received=192.168.0.2
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 101 INVITE
User-Agent: 2N Helios IP Force 2.9.0.18.5
Content-Length: 0
Sep 10 15:45:01 UC320W user.debug voice: SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-75c6cae6;received=192.168.0.2
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>;tag=24185
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 101 INVITE
Contact: <sip:00@192.168.0.190:5060>
User-Agent: 2N Helios IP Force 2.9.0.18.5
Content-Length: 0
Sep 10 15:45:01 UC320W user.debug voice: SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-75c6cae6;received=192.168.0.2
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>;tag=24185
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 101 INVITE
Contact: <sip:00@192.168.0.190:5060>
Content-Type: application/sdp
Allow: REGISTER, INVITE, ACK, CANCEL, OPTIONS, BYE, INFO, NOTIFY
User-Agent: 2N Helios IP Force 2.9.0.18.5
Content-Length: 203
v=0
o=- 768630426 1212044747 IN IP4 192.168.0.190
s=HIP 2.9.0.18.5
t=0 0
m=audio 5000 RTP/AVP 0 101
c=IN IP4 192.168.0.190
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
Sep 10 15:45:01 UC320W user.debug voice: ACK sip:00@192.168.0.190:5060 SIP/2.0
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-c4862548
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>;tag=24185
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 101 ACK
Max-Forwards: 70
Contact: "FrontDoor" <sip:500@10.1.1.16:5060;ref=500>
User-Agent: Cisco/UC320W-2.3.3(4)
Allow-Events: talk, hold, conference, x-spa-cti
Content-Length: 0
Sep 10 15:45:04 UC320W user.debug voice: RTP Stat:209<--SIP.1 (NLR: 0/256)
Sep 10 15:45:04 UC320W user.debug voice: BYE sip:00@192.168.0.190:5060 SIP/2.0
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-dba4f6ff
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>;tag=24185
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 102 BYE
Max-Forwards: 70
P-RTP-Stat: PS=120,OS=28800,PR=0,OR=0,PL=0,JI=0,LA=0,DU=3,EN=G711u,DE=G711u
User-Agent: Cisco/UC320W-2.3.3(4)
Allow-Events: talk, hold, conference, x-spa-cti
Content-Length: 0
Sep 10 15:45:04 UC320W user.debug voice: SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.1.1.16:5060;branch=z9hG4bK-dba4f6ff;received=192.168.0.2
From: "FrontDoor" <sip:500@192.168.0.190>;tag=8d8ef80275dba06fo5;ref=209
To: <sip:00@192.168.0.190>;tag=24185
Call-ID: 551f01be-8de6c1e3@10.1.1.16
CSeq: 102 BYE
User-Agent: 2N Helios IP Force 2.9.0.18.5
Content-Length: 0