DTMF Not Functioning Through SBC (Doc ID 2052357.1)

Last updated on SEPTEMBER 06, 2015

Applies to:

Net-Net OS - Version E-Cz7.3.0 to E-Cz7.3.0 [Release E-Cz7.0]
Information in this document applies to any platform.

Symptoms

We have a PBX which is not allowing DTMF when calls are sent via the SBC. If we send calls via same SIP service without the SBC in the route then DTMF is working as it should
The PBX is responding with a SIP 403 error

========================
2015-09-04 10:40:32.823
SIP/2.0 403 Forbidden
Via: SIP/2.0/UDP 172.31.169.166:5062;branch=z9hG4bKkdeiqg10dgq336ffn820.1
Call-ID: 23d674e1ae!!o8kirv-w5s@103.10.82.62
CSeq: 2 INFO
From: <sip:xxxxxxxxxxx172.31.169.166:5060>;tag=104057376758701
To: <sip:xxxxxxxxxxxx@172.26.126.100:5062>;tag=esxozr1g
Content-Length: 0
Server: IPFX-UA B2BUA-6.2.220.0000
IPFX-Reason: "Not allowed"
========================

Cause

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