Hi,
there seems to be a bug in spa5xx 7.5.5 firmware related to srtp.
scenario
2 SPA504G phones connected to freeswitch with s-descriptor on srtp method and secure call settings ON
freeswitch by default will offer both RTP/SAVP and RTP/AVP when briding the call to phone B.
phone A calls phone B with srtp enabled.
freeswitch accepts the call and bridges the call to phone b.
since phone A started the call with srtp, freeswitch passes to phone B the option to secure the call and sends both RTP/SAVP and RTP/AVP
o=FreeSWITCH 1380857320 1380857321 IN IP4 192.168.16.128
s=FreeSWITCH
c=IN IP4 192.168.16.128
t=0 0
m=audio 22742 RTP/SAVP 0 8 9 4 101 13
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:TT94irJQHRiPIKBxxjHiCSa15oyOhSm0Q+94UcpA
a=ptime:30
a=sendrecv
m=audio 22742 RTP/AVP 0 8 9 4 101 13
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:30
a=sendrecv
when this happens , phone will freeze and will not accept any key input (menu, numbers, etc) or calls.
the only way is to turn off/on
there is a parameter in freeswitch that allows to offer only RTP/SAVP and in that case it works very well with both sides of call being secure.
i think the phone B should check both RTP/SAVP RTP/AVP and choose accordinly to his setup because, we don't have a way to know in advance if the phone has srtp enabled and would like to offer both methods (this works with other ip phones and softphones)
any comments ?
cheers
