Does it possible to configure a longer DTMF tone generated by UC520 CME when key press on the IP handset ? Currently it is too short/fast for some of the IVR to recognize it.
If you have a FXO port, you can use this command:
The default is 100 ms. By ITU standards, anything over 40ms should be detected.
Unfortunately I'm using the SIP trunk and the dial peer is setup as "dtmf-relay rtp-nte"
Any possibilities to change DTMF timing sent through the RTP ?
This is actually good news.
You can try this:
On 12.4(20)T and later:
voice service voip
The UC520 is on 12.4(24)T.
Just test out, it doesn't give any different. And still not able to access some of the IVR.