[WXC/VFX] DTMF from Asterisk not working... anyone else seen this?

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yano1980

2 posts

Wannabe Geek

#424858 7-Jan-2011 01:14

This is interesting, I work for a large ITSP in the UK and have been working through a fault with a customer who connects to our SBC via SIP trunk and has the exact same issue.

They are using the following software.

User-Agent: Asterisk PBX 1.6.2.15

I have been running debug on our SBC and Cisco media gateways to try and determine the cause of the problem (possible malformed media packets etc) but have not been able to pin point the issue. I believe the issue is software related on the Asterisk.

The only way we can workaround the problem is by setting the Asterisk to use SIP INFO, this works on every occasion. Btw if you receive '488 media not acceptable' from your provider it is just indicating that there gateway or SIP stack is not set to use SIP INFO.

Did you ever find a fix for this problem, and/or a reason for the DTMF detection using RFC2833 failing?

Thanks,

sbiddle

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#424878 7-Jan-2011 07:32

yano1980: This is interesting, I work for a large ITSP in the UK and have been working through a fault with a customer who connects to our SBC via SIP trunk and has the exact same issue.

They are using the following software.

User-Agent: Asterisk PBX 1.6.2.15

I have been running debug on our SBC and Cisco media gateways to try and determine the cause of the problem (possible malformed media packets etc) but have not been able to pin point the issue. I believe the issue is software related on the Asterisk.

The only way we can workaround the problem is by setting the Asterisk to use SIP INFO, this works on every occasion. Btw if you receive '488 media not acceptable' from your provider it is just indicating that there gateway or SIP stack is not set to use SIP INFO.

Did you ever find a fix for this problem, and/or a reason for the DTMF detection using RFC2833 failing?

Thanks,

I actually encoounted some an issue recently with a trixbox 2.8.0.4 machine doing whierd stuff with DTMF. Asterisk has had known DTMF issues over the years so I'd place the blame on it, however fixing it easily is another issue entirely!

gingofthesouth

42 posts

Geek

#427200 14-Jan-2011 16:15

I know this is an old thread but I thought I would point out that I too had issues with DTMF tones when using Asterisk with xnet.

Couldn't used phone banking etc or press anything to activate a menu option etc.

Recently switched back to using VFX as i had issues with this and also with some calls not getting through while others would etc.

Anyhow, hope you fixed your issue full time.

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