3CX - unable to use automatic menu systems

[jimmyjamesjimmy]

Hey Guys

I have a weird issue with my 3CX phone server.
When I call a company (e.g. bank) that has an automated menu system (e.g. select 1 for sales, 2 for billing), I can't make the selection, it doesn't register, so I can't proceed.

Have I missed a setting in my 3CX server or my Yearlink T26P/T28P phones?

My system is 3CX v11.0.28976.849 SP4 and I have VOIP lines only.

I'm not sure what could be causing this.

Kind Regards
Jimmy

 

[craigreilly]

Some light reading...

http://www.3cx.com/blog/voip-howto/dtmf-rfc2833/
http://www.3cx.com/forums/dtmf-tones-not-recognized-4442.html
http://www.voipmechanic.com/dtmf-issues.htm

I find it works 9 out of 10 times then I find a random system that doesn't work...

 

[eagle2]

Depends only on your provider and how DTMF tones are handled. For reliable transmiton you must use everywhere RFC2833 (lines, PBX, phones).

 

[jimmyjamesjimmy]

thanks for the links guys, had my DTMF set to INBAND, changing to RFC2833 did the trick