I am having a weird DTMF issue on CME 10.5 when calling into Unity Express Voice mail 8.6.7. When a user calls in to check voice mail or anything else that requires DTMF, I am getting a 1-2 second delay between when the button is pressed and when the tone is heard on the handset. The buttons that are pressed go through but it is delayed.
Anyone have any ideas what could be causing this? All of the phones are 7841 SIP phones.
Phones are configured similar to this:
voice register pool 28 busy-trigger-per-button 4 id mac 0008.2F1A.29EA type 7841 number 1 dn 28 dtmf-relay rtp-nte description x4132 Phn RM codec g711ulaw
Voice mail Dial-peer:
dial-peer voice 51 voip destination-pattern 409.$ b2bua session protocol sipv2 session target ipv4:172.29.32.2 dtmf-relay sip-notify no dtmf-interworking codec g711ulaw no vad
I tried your suggestion and this did not fix the issues. I did find the following bug and this seems to be the issue with my phones. As of today, I have upgraded the 7941 phones to the latest firmware available and still have the same issues. I do also have 9951 Phones and they do not have this issue.
CSCuj64649 - Sometimes DTMF for digits during VM has a delay
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