Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
New Member

CUCMBE dtmf doesn't work via SIP Trunk to PSTN

The dtmf events packets send by CUCMBE have incorrect UDP Length. Based on RFC 2833 a correct UDP length value for dtmf event packets is 24 (decimal), but this CUCMBE sends its events packets with UDP length set to 36 (decimal). Since the events packets have an incorrect udp length field, it is causing the ITSP to discard the packet. The CUCMBE version is 7.1.3.30000-1.

The attachment fiel TestNo1.bmp is a capture with wireshark that show the udp length with 36. It was taken in CUCMBE version 7.1.3

However, with a CUCMBE version 8.6.2 it works well and it formats the events packets with udp length with 24.

The attachment fiel GoodTestNo.bmp is a capture with wireshark that show the udp length with 24. It was taken in CUCMBE version 8.6.2

I'll appreciate any help.

BR

Juan

486
Views
0
Helpful
0
Replies
CreatePlease to create content