[asterisk-users] No sound with internal calls depending on which phones

[(lists) Denis BUCHER]

Dear all,

I have a very strange problem :

  * external calls work perfectly,
  * internal calls between some phones too,
  * but internal call between two similar phones don't work !!! (Snom 710)

When we have sound, there are no errors in asterisk. When we do not have 
sound, there is the following error :

  * [Nov 10 17:51:47] ERROR[21480]: chan_sip.c:28306 setup_srtp: No SRTP
    module loaded, can't setup SRTP session.

This is a working internal call :
>   == Using SIP RTP CoS mark 5
>     -- Executing [301 at local:1] Dial("SIP/dbucher-00000000", 
> "SIP/phone1") in new stack
>   == Using SIP RTP CoS mark 5
>     -- Called phone1
>     -- SIP/phone1-00000001 is ringing
>     -- SIP/phone1-00000001 is ringing
>     -- SIP/phone1-00000001 is ringing
>     -- SIP/phone1-00000001 is ringing
>     -- SIP/phone1-00000001 is ringing
>     -- SIP/phone1-00000001 answered SIP/dbucher-00000000
>     -- Remotely bridging SIP/dbucher-00000000 and SIP/phone1-00000001
> Sent RTP P2P packet to 192.168.128.99:49646 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.99:49646 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.99:49646 (type 00, len 000160)
> Got  RTP packet from    192.168.128.99:49646 (type 126, seq 031575, ts 
> 000001, len 000000)
> [Nov 10 17:50:50] NOTICE[21513]: res_rtp_asterisk.c:2190 ast_rtp_read: 
> Unknown RTP codec 126 received from '192.168.128.99:49646'
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:57818 (type 00, len 000160)
>   == Spawn extension (local, 301, 1) exited non-zero on 
> 'SIP/dbucher-00000000'
This is a non-working call :
>   == Using SIP RTP CoS mark 5
> [Nov 10 17:51:47] ERROR[21480]: chan_sip.c:28306 setup_srtp: No SRTP 
> module loaded, can't setup SRTP session.
>     -- Executing [301 at local:1] Dial("SIP/hsolutionspf5-00000002", 
> "SIP/phone1") in new stack
>   == Using SIP RTP CoS mark 5
>     -- Called phone1
>     -- SIP/phone1-00000003 is ringing
>     -- SIP/phone1-00000003 is ringing
>     -- SIP/phone1-00000003 is ringing
>     -- SIP/phone1-00000003 is ringing
>     -- SIP/phone1-00000003 is ringing
>     -- SIP/phone1-00000003 answered SIP/hsolutionspf5-00000002
>     -- Remotely bridging SIP/hsolutionspf5-00000002 and 
> SIP/phone1-00000003
> Sent RTP P2P packet to 192.168.128.228:65494 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.228:65494 (type 00, len 000160)
> Sent RTP P2P packet to 192.168.128.231:51350 (type 03, len 000033)
> Sent RTP P2P packet to 192.168.128.231:51350 (type 03, len 000033)
> Sent RTP P2P packet to 192.168.128.231:51350 (type 03, len 000033)
> Sent RTP P2P packet to 192.168.128.231:51350 (type 03, len 000033)
> Sent RTP P2P packet to 192.168.128.231:51350 (type 03, len 000033)
> Sent RTP P2P packet to 192.168.128.231:51350 (type 03, len 000033)
>   == Spawn extension (local, 301, 1) exited non-zero on 
> 'SIP/hsolutionspf5-00000002'
I tried many options to disable SRTP but without success :

  * canreinvite = no
  * canreinvite = nonat
  * srtpcapable=no
  * encryption=no
  * directmedia=nonat
  * ...or noload => res_srtp.so in modules.conf


Any help would be GREATLY appreciated !

Denis

P. S. We have Asterisk 1.8.4.4 under CentOS release 5.11 (Final)

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