I wasted a lot of time on this issue with an Audiocodes FXO gateway I am currently exploring possible
workarounds. Of course, I would really like to see a patch on the asterisk-cvs mail list. :)


Gerard O'Rourke wrote:

Hi,

We are using Asterisk for a h323 / SIP converter.
We are having problems when users enter DTMF quickly.

The reason for the problem is that the Timestamp Header field in the RTP
stream
for the 2 separate DTMF events are set at the same number.

Has anyone else had this problem and does anyone know if there is a fix for
it?

See below for trace:
Note how the Timestamp header is set to "24352" in both cases.
Our system ignores the first DTMF because of this.

Note: Cisco uses a much larger timestamp header than this ( a 4 digit HEX
number e.g. Timestamp: 1527784437
And never use the same Timestamp for separate DTMF events.

Rgs,
Gerard.



User Datagram Protocol, Src Port: 6934 (6934), Dst Port: 1686 (1686)
Real-Time Transport Protocol
   10.. .... = Version: RFC 1889 Version (2)
   ..0. .... = Padding: False
   ...0 .... = Extension: False
   .... 0000 = Contributing source identifiers count: 0
   1... .... = Marker: True
   .110 0101 = Payload type: Unknown (101)
   Sequence number: 33529
   Timestamp: 24352
   Synchronization Source identifier: 1497941844
RFC 2833 RTP Event
   Event ID: DTMF Two 2 (2)
   0... .... = End of Event: False
   .0.. .... = Reserved: False
   ..00 1010 = Volume: 10
   Event Duration: 0


User Datagram Protocol, Src Port: 6934 (6934), Dst Port: 1686 (1686) Real-Time Transport Protocol 10.. .... = Version: RFC 1889 Version (2) ..0. .... = Padding: False ...0 .... = Extension: False .... 0000 = Contributing source identifiers count: 0 1... .... = Marker: True .110 0101 = Payload type: Unknown (101) Sequence number: 33531 Timestamp: 24352 Synchronization Source identifier: 1497941844 RFC 2833 RTP Event Event ID: DTMF Three 3 (3) 0... .... = End of Event: False .0.. .... = Reserved: False ..00 1010 = Volume: 10 Event Duration: 0


--------------- Gerard O'Rourke Connectivity Technology Manager V O X P I L O T +353 1 209 1919


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