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Mitel Forums => Mitel MiVoice Business/MCD/3300 => Topic started by: Tech Electronics on May 26, 2021, 03:08:53 PM

Title: SIP Forwarding DTMF Issue
Post by: Tech Electronics on May 26, 2021, 03:08:53 PM

Guys,

We have an issue where a call comes in to the System and then gets sent back out to an 8xx number. When the callers get the IVR at the 8xx number it is not recognizing DTMF, but it was at the NuPoint.

Working with the SIP Provider and getting packet captures, we don't have an MBG, they are saying that the second call, Forwarded, going out to the 8xx number is not putting any SDP in the message and therefor they are sending it out as an In-Band DTMF call instead of Out-Of-Band.

Does anyone know how to solve this problem as I already have Send SDP in the Initial INVITE set to yes as that was a requirement originally?

Thanks,

TE

Title: Re: SIP Forwarding DTMF Issue
Post by: nikolas on March 11, 2024, 09:28:37 AM

Hello everyone, same issue here. Having an IVR implemented on NuPoint with MiVB ICP3300. When incoming DTMFs are sent with in-band method, NuPoint does not recognize them. RFC4733 works just fine.

Any idea on that?