Ast 1.2.10 send DTMF RFC2833 UDP BAD CHECKSUM

Asterisk Asterisk Support
1

Hi,
Using: Asterisk 1.2.10
OS: Linux ast2 2.6.9-39.0.2.ELsmp #1 SMP Thu Jul 13 06:56:04 CDT 2006 i686 i686 i386 GNU/Linux

I’m having trouble with the dtmf=rfc2833 that asterisk sends, it’s never accepted by my equipment at the other end (Tekelec T7000)
And I did some tcpdump, and after checking it in ethereal, it seems that the UDP packets that Asterisk sends for DTMF all have bad CHECKSUM
ex:
Checksum: 0x85ba [incorrect, should be 0x2390]
And in fact, all those packets are sent with checksum= 0x85ba

I cheked the release notes, and didn’t see anything about that in the newer version, but is it problem that is fixed in newer versions?

2

Oh, also the Asterisk sets ‘Event Duration: 0’ in the first 3 rtp dtmf packets sent, I don’t think that follows the standard.

Nobody got any idea of why the bad UDP checksum?

3

I’m having a similar problem with outbound DTMF to my carrier over a SIP trunk. The carrier reports seeing the duration of 0, and I’m only getting about 50% of DTMF tones to go through.

Using Asterisk 1.2.14