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 ? Thank you ! << [ TYPE: Control (4) SUBCLASS: Ringing (3) ] [SIP/GWCISCO5400O-600bfcc8] << [ TYPE: Control (4) SUBCLASS: Answer (4) ] [SIP/GWCISCO5400O-600bfcc8] << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] << [ TYPE: Control (4) SUBCLASS: T38/Negotiation Requested (19) ] [SIP/GWCISCO5400O-600bfcc8] << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] [Jul 16 17:50:39] NOTICE[2736]: 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-600bfcc8] [Jul 16 17:50:40] NOTICE[2736]: 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-600bfcc8] [Jul 16 17:50:41] NOTICE[2736]: 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-600bfcc8] << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20090716/ca27b55f/attachment.htm
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
Xavier Cardil escribi?:> 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 ? > > Thank you ! > > > > << [ TYPE: Control (4) SUBCLASS: Ringing (3) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Control (4) SUBCLASS: Answer (4) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Control (4) SUBCLASS: T38/Negotiation Requested (19) ] > [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > [Jul 16 17:50:39] NOTICE[2736]: 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-600bfcc8] > [Jul 16 17:50:40] NOTICE[2736]: 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-600bfcc8] > [Jul 16 17:50:41] NOTICE[2736]: 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-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8]It looks like the Cisco gateway is trying to negotiate or send some video codec or something which asterisk does not recognize. According to the spec (http://www.iana.org/assignments/rtp-parameters), The codecs 96 to 127 are dynamic RTP payloads that are negotiated with another protocols to define them. If everything else on your fax session works fine, this message shouldn't be a problem. I think this is much like the X-lite 126 codec type message: [Jul 16 11:35:57] NOTICE[10989]: rtp.c:1287 ast_rtp_read: Unknown RTP codec 126 received from '0.0.0.0' And doesn't pose a problem anyway. -- Ing. Miguel Molina Grupo de Tecnolog?a Millenium Phone Center PBX: (+57 1)6500800 ext. 1201 Fax: (+57 1)6500816 M?vil: (+57)3138873587
Xavier Cardil schrieb:> 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 ? > > Thank you ! > > > > << [ TYPE: Control (4) SUBCLASS: Ringing (3) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Control (4) SUBCLASS: Answer (4) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Control (4) SUBCLASS: T38/Negotiation Requested (19) ] > [SIP/GWCISCO5400O-600bfcc8] > << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [SIP/GWCISCO5400O-600bfcc8] > [Jul 16 17:50:39] NOTICE[2736]: rtp.c:1739 ast_rtp_read: Unknown RTP > codec 96 received from '192.168.3.163'Is '192.168.3.163' the Cisco GW? If yes, then it is probably an NSE packet. NSE is a Cisco proprietary FaxoverIP solution and uses per default payload types 96 and 97 to signal a changeover from VoIP to FoIP. Probably you have to configure the Cisco GW to use T.38 instead of NSE for FoIP. regards klaus