Outbound Call Issues

[nmirza]

I am experiencing issues with phone calls. I can receive and make calls fine but whenever I make a call to any number that has an auto attendant, I run into issues. When I'm on the phone and the auto attendant asks me to pick an option, no matter how many times I press the option, the phone does not recognize any input while on the phone. Is there anything I need to setup with GrandStream?

My 3CX system is setup in 1 location with Yealink T26 and T28 phones. Also, the calls are routed through GrandStream GXW-4108.

 

[leejor]

The DTMF Method set on the phone, must work (be the same) with the DTMF Method set on the gateway. In most cases, a SIP message (one of several types) is sent for each numeric button press, this is interpreted at the gateway and the DTMF tone re-generated then sent out on the PSTN line.

http://www.3cx.com/blog/voip-howto/dtmf-rfc2833/

 

[nmirza]

I found the DTMF settings on the GrandStream setup page but can't locate the settings page for the phone? How can I set both up to make sure they're the same.