[asterisk-users] T38 negotiation, the last step !

[Xavier Cardil]

Hi Kelvin, thank you for your response, well in fact it is not working but
that's only a NOTICE, not an error. Warnings comes after that and the fax is
not sent. Take a look at the last lines of this output :


<< [ TYPE: Control (4) SUBCLASS: Ringing (3) ] [SIP/GWCISCO5400O-01ba5638]
IVR3*CLI> debug channel
all                        SIP/GWCISCO5400O-01ba5638
SIP/T38modem-01ba2178
<< [ TYPE: Control (4) SUBCLASS: Answer (4) ] [SIP/GWCISCO5400O-01ba5638]
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
<< [ TYPE: Control (4) SUBCLASS: T38/Negotiation Requested (19) ]
[SIP/GWCISCO5400O-01ba5638]
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
[Jul 16 18:20:20] NOTICE[2846]: rtp.c:1739 ast_rtp_read: Unknown RTP codec
96 received from '192.168.3.163'
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
[Jul 16 18:20:21] NOTICE[2846]: rtp.c:1739 ast_rtp_read: Unknown RTP codec
96 received from '192.168.3.163'
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
[Jul 16 18:20:21] NOTICE[2846]: rtp.c:1739 ast_rtp_read: Unknown RTP codec
96 received from '192.168.3.163'
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-01ba5638]
[Jul 16 18:20:30] WARNING[2815]: chan_sip.c:3075 retrans_pkt: Maximum
retries exceeded on transmission
1af1c92e-9270-de11-8264-001517bb9e3e at IVR3for seqno 1 (Critical
Response) -- See doc/sip-retransmit.txt.
[Jul 16 18:20:30] WARNING[2815]: chan_sip.c:3102 retrans_pkt: Hanging up
call 1af1c92e-9270-de11-8264-001517bb9e3e at IVR3 - no reply to our critical
packet (see doc/sip-retransmit.txt).

Do you have an idea of what is happening ? I sniffed UDP traffic on port
5060 and I get :
INVITE SDP ( t38 ) ---------------------->
TRYING <----------------------------------
NOT ACCEPTABLE HERE<------------
ACK------------------------------------------------>
BYE<-----------------------------------------------
200 OK-------------------------------------------->

Thanks  for your help.



On Thu, Jul 16, 2009 at 6:17 PM, Kevin P. Fleming <kpfleming at digium.com>wrote:

> Xavier Cardil wrote:
> > Hi, I've managed to get HYLAFAX---->T38MODEM----->
> > ASTERISK---->CISCOAS5400 working, but when they are negotiating asterisk
> > drops a message telling "Unknown RTP codec 96 received from gateway" Do
> > somebody know how to fix it ?
>
> There's nothing to fix; the gateway sent an expected RTP packet, which
> Asterisk dropped. If your FAX works, then you can ignore this.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kpfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
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