Quote:
Originally Posted by boatman
I have only IP phones here, my calls to the PSTN go out via carriers.icall.net. I have had some issues with my credit card company not always understanding my DTMF tones. The problem may be that my DTMF tones are not getting through to the Sipbroker PSTN gateway.
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That sounds likely. If your phone company has issues properly sending DTMF tones, than pretty much all the PSTN gateways are going to have issues. Which will probably make it hard to "test" them.
OTOH if you have IP phones, why not just use either sipbroker.com or voxalot.com directly (bypassing the PSTN numbers)? Not only will that likely be more reliable, but it will also avoid tying up one of the PSTN numbers for your call. i.e. accessing the sipbroker.com proxy directly, is not only more likely to work from your IP phones, but it's also more efficient routing on the SIP Broker end of things as well (making it a win-win situation IMHO).
Quote:
Originally Posted by boatman
My SIP device is a Linksys SPA2102. There are some settings for DTMF stuff, here is what it's got now:
DTMF Process INFO: yes
DTMF Process AVT: yes
DTMF Tx Method: Auto
DTMF Tx Mode: Strict
Should I change any of those?
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DTMF with VoIP is always a YMMV thing. Sometimes you can never get it to work, and at other times one or more of the settings work (and which settings work with DTMF also tends to vary with the provider you are using, making it also a YMMV thing).
What CODEC do you use for your VoIP? It wouldn't be the high bandwidth G711u CODEC by any chance? If so, try setting the DTMF transmit method to "InBand", as that often (but not always) works best with the G711u CODEC. However, keep in mind that "InBand" will ONLY WORK with the two high bandwidth CODECs (i.e. G711u and G711a). For all other CODECs you will get total DTMF failure if/when you try "InBand"...