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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