[OpenSIPS-Users] help: nathelper/rtpproxy/ice/ice-mismatch

[george wu]

When I use nathelper/rtpproxy, ice does not work well with it.
nathelper will rewrite the sdp media part which my ice client is not happy.
Then it will reply a=ice-mismatch. finally it will use rtpproxy to relay the media.

the invite:
m=audio 36580 RTP/AVP 124 120 111 110 0 8 101
....
a=candidate:1 1 UDP 2130706431 192.168.1.3 7078 typ host
a=candidate:1 2 UDP 2130706430 192.168.1.3 7079 typ host

Detail is below:


1) I have set up the nathelper/rtpproxy as below:
####  NAT modules
loadmodule "nathelper.so"
modparam("nathelper", "natping_interval", 10)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "received_avp", "$avp(received_nh)")

loadmodule "rtpproxy.so"
modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:12221") # CUSTOMIZE ME

loadmodule "stun.so"
modparam("stun", "primary_ip", "192.168.1.3")
modparam("stun","alternate_ip","192.168.122.1")

2) my client is linphone with ice set up.
3) when it make a call with ice, the sdp media get relayed:
INVITE sip:test2 at 192.168.1.3:5080 SIP/2.0
Record-Route: <sip:192.168.1.3;lr;nat=yes>
Via: SIP/2.0/UDP 192.168.1.3:5060;branch=z9hG4bKa00d.25386e01.0
Via: SIP/2.0/UDP 192.168.1.3:5070;received=192.168.1.3;branch=z9hG4bK.bo~6nN-3E;rport=5070
From: <sip:test1 at 192.168.1.3>;tag=0tEh0Q~ly
To: sip:test2 at 192.168.1.3
CSeq: 20 INVITE
Call-ID: XvJ7qOUjnp
Max-Forwards: 69
Supported: replaces, outbound
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
Content-Type: application/sdp
Content-Length: 547
Contact: <sip:test1 at 192.168.1.3:5070>;+sip.instance="<urn:uuid:866598bd-4f5e-47f9-b7fa-8be6c6883a57>"
User-Agent: linphone/3.7.0 (belle-sip/1.3.0)

v=0
o=test1 1936 2136 IN IP4 192.168.1.3
s=Talk
c=IN IP4 192.168.1.3
t=0 0
a=ice-pwd:741608ce2b68ba853500cdf3
a=ice-ufrag:0d47513b
m=audio 36580 RTP/AVP 124 120 111 110 0 8 101
a=rtpmap:124 opus/48000
a=fmtp:124 useinbandfec=1; usedtx=1
a=rtpmap:120 SILK/16000
a=rtpmap:111 speex/16000
a=fmtp:111 vbr=on
a=rtpmap:110 speex/8000
a=fmtp:110 vbr=on
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=candidate:1 1 UDP 2130706431 192.168.1.3 7078 typ host
a=candidate:1 2 UDP 2130706430 192.168.1.3 7079 typ host
a=nortpproxy:yes
//////////////////
SIP/2.0 200 Ok
Via: SIP/2.0/UDP 192.168.1.3:5060;branch=z9hG4bKa00d.25386e01.0
Via: SIP/2.0/UDP 192.168.1.3:5070;received=192.168.1.3;branch=z9hG4bK.bo~6nN-3E;rport=5070
From: <sip:test1 at 192.168.1.3>;tag=0tEh0Q~ly
To: <sip:test2 at 192.168.1.3>;tag=OsFF6CF
Call-ID: XvJ7qOUjnp
CSeq: 20 INVITE
User-Agent: linphone/3.7.0 (belle-sip/1.3.0)
Supported: replaces, outbound
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
Contact: <sip:test2 at 192.168.1.3:5080>;+sip.instance="<urn:uuid:466598bd-4f5e-47f9-b7fa-8be6c6883a57>"
Content-Type: application/sdp
Content-Length: 428
Record-route: <sip:192.168.1.3;lr;nat=yes>

v=0
o=test2 2088 1279 IN IP4 192.168.1.3
s=Talk
c=IN IP4 192.168.1.3
t=0 0
a=ice-pwd:52c18fd43896c0d573decfcd
a=ice-ufrag:5d79a96c
m=audio 7088 RTP/AVP 124 120 111 110 0 8 101
a=rtpmap:124 opus/48000
a=fmtp:124 useinbandfec=1; usedtx=1
a=rtpmap:120 SILK/16000
a=rtpmap:111 speex/16000
a=fmtp:111 vbr=on
a=rtpmap:110 speex/8000
a=fmtp:110 vbr=on
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ice-mismatch


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