User guide

Troubleshooting the SCOPIA Gateway 175
Resolving DTMF Issues
RESOLVING DTMF
ISSUES
This section describes what to do if DTMF is not operating correctly.
Possible Causes Verification Steps
DTMF is not enabled in the Gateway. IP-to-ISDN calls
 At Gateway > Settings >
Advanced verify that Translate
DTMF signal from IP
Out-of-band (H.245) to ISDN
in-band (ISDN G.711 only) is
checked.
 If this is a video call, verify that
this option is checked for both
voice and video calls.
ISDN-to-IP calls
 At Gateway > Settings >
Advanced verify that Duplicate
DTMF Signal from ISDN side as
Out of band on IP side is checked.
The Gateway does not properly identify
DTMF tones.
Open a Telnet connection to the Gateway
and verify that you see the DTMFs in the
Gateway log. If not, verify that the ISDN
endpoint generates the DTMF tones.
An incorrect audio codec is used. Verify that the G.711 audio codec is used in
the call is G.711 (the Gateway supports
DTMF detection for G.711 only). If another
audio codec is used, force the call to G.711
mode by disabling all the audio media
modes at Gateway > Settings > Media
Modes.
If the problem is not resolved, contact
RADVISION Customer Support.
Provide the following information to
RADVISION Customer Support:
 Gateway traces with level 6.
 H.323 stack log.