[SIPForum-discussion] What does mean "a=inactive"?

[Rodrigo Pimenta Carvalho]

Dear SIP Forum users;

I have 2 softphones with SIP UAC: in phone A and in phone B. There is a SIP Proxy between they too.


When A calls B, I can see the SIP messages (via wireshark) and in some moment A sends a SIP UPDATE do B.

The SIP UPDATE has SDP with lines like this:


v=0
o=- 3681643549 3681643550 IN IP4 XXX.YYY240.204
s=pjmedia
b=AS:84
t=0 0
a=X-nat:1
m=audio 64568 RTP/AVP 110 8 101
c=IN IP4 XXX.YYY240.204
b=TIAS:64000
a=rtpmap:110 speex/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ice-ufrag:139d7049
a=ice-pwd:692c4a80
a=rtcp:64571 IN IP4 XXX.YYY240.204
a=candidate:Sc0a81485 1 UDP 1862270975 XXX.YYY240.204 64568 typ srflx raddr 192.168.20.133 rport 64568
a=candidate:Sc0a81485 2 UDP 1862270974 XXX.YYY240.204 64571 typ srflx raddr 192.168.20.133 rport 64571
a=remote-candidates:1 XXX.YYY240.71 64993 2 XXX.YYY240.71 64996
a=sendrecv

However, if I replace the SIP Proxy with another one containing the same software (just hardware is different) and
run the same call (A calls B), that "a=sendrecv" in SIP UPDATE changes to "a=inactive"


I have no idea what could cause this difference related to media attribute!

Could someone here give some examples of what could cause an "a=inactive", so that I will have a point to start my analyze of the problem?

Any hint will be very helpful!

Best regards.



RODRIGO PIMENTA CARVALHO
Inatel Competence Center
Software
Ph: +55 35 3471 9200 RAMAL 979
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