I was calling a T22P, firmware 7.70.0.150, phone with a softphone that supports sRTP. With sRTP set to optional the T22P does not ring. With sRTP set to disable the phone rings.
I have included the INVITE's for both cases.
INVITE where phone rings
INVITE sip:poiuyt@xxx.yyy.101.124:5062 SIP/2.0
Record-Route: <sip:161.29.126.70;lr;ftag=q2Q77VwekuMmfkJorDSufXMcbfoIWmbC;did=69b.a3625c32>
Via: SIP/2.0/UDP 161.29.126.70;branch=z9hG4bKb27.8a74451.0
Via: SIP/2.0/UDP 192.168.1.100:64601;received=xxx.75.166.92;rport=50815;branch=z9hG4bKPjtNFiu.o6hbtXdW5e1NmfsMbWE8fL-pkO
Max-Forwards: 69
From: "Ppppp" <sip:lkjhgf@mergecom.net.nz>;tag=q2Q77VwekuMmfkJorDSufXMcbfoIWmbC
To: <sip:poiuyt@mergecom.net.nz>
Contact: <sip:02465813@xxx.75.166.92:50815>
Call-ID: UyZur4xcLgqz5SzzqBW7IGKvh51VBygE
CSeq: 31387 INVITE
Allow: SUBSCRIBE, NOTIFY, PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, MESSAGE, REFER
Supported: 100rel, replaces, norefersub, gruu
User-Agent: Blink Pro 3.0.0 (MacOSX)
Content-Type: application/sdp
Content-Length: 395
Privacy: none
P-Asserted-Identity: <sip:mnbvcx@mergecom.net.nz>
Remote-Party-ID: <sip:mnbvcx@mergecom.net.nz>;party=calling;id-type=subscriber;privacy=off;screen=yes
v=0
o=- 3587791371 3587791371 IN IP4 192.168.1.100
s=Blink Pro 3.0.0 (MacOSX)
c=IN IP4 161.29.126.68
t=0 0
m=audio 52950 RTP/AVP 108 99 98 9 0 8 96
c=IN IP4 161.29.126.68
a=rtcp:52951
a=rtpmap:108 opus/48000
a=rtpmap:99 speex/32000
a=rtpmap:98 speex/16000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-15
a=sendrecv
INVITE where phone does not ring
INVITE sip:poiuyt@xxx.yyy.101.124:5062 SIP/2.0
Record-Route: <sip:161.29.126.70;lr;ftag=ZQdlK.AMpzx5hJgSmAyN6AD5oWHdBpUy;did=b48.ab787d63>
Via: SIP/2.0/UDP 161.29.126.70;branch=z9hG4bK294b.97451672.0
Via: SIP/2.0/UDP 192.168.1.100:49906;received=xxx.75.166.92;rport=50533;branch=z9hG4bKPj7OPvNVSQJtGHAa66xNWt4FTpSrVzav5x
Max-Forwards: 69
From: "Ppppp" <sip:lkjhgf@mergecom.net.nz>;tag=ZQdlK.AMpzx5hJgSmAyN6AD5oWHdBpUy
To: <sip:poiuyt@mergecom.net.nz>
Contact: <sip:21538604@xxx.75.166.92:50533>
Call-ID: 92mYVYU9A3hMBHSOO3MwPuW..mDLdnBt
CSeq: 30072 INVITE
Allow: SUBSCRIBE, NOTIFY, PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, MESSAGE, REFER
Supported: 100rel, replaces, norefersub, gruu
User-Agent: Blink Pro 3.0.0 (MacOSX)
Content-Type: application/sdp
Content-Length: 563
Privacy: none
P-Asserted-Identity: <sip:zxcvbn@mergecom.net.nz>
Remote-Party-ID: <sip:zxcvbnm@mergecom.net.nz>;party=calling;id-type=subscriber;privacy=off;screen=yes
v=0
o=- 3587703726 3587703726 IN IP4 192.168.1.100
s=Blink Pro 3.0.0 (MacOSX)
c=IN IP4 161.29.126.69
t=0 0
m=audio 55326 RTP/AVP 108 99 98 9 0 8 96
c=IN IP4 161.29.126.69
a=rtcp:55327
a=rtpmap:108 opus/48000
a=rtpmap:99 speex/32000
a=rtpmap:98 speex/16000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-15
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:lRY4LUO/l/w11V1OyLuvXB38/uMhPMHb7ai2E+tw
a=crypto:2 AES_CM_128_HMAC_SHA1_32 inline:2odHA3gIT9nPlYnh7b9ljBzY4OTJ89XUdNVNXNMP
a=sendrecv
Is this a bug??