DTMF recognition problem

Asterisk Asterisk Support
1

Hi,
I have a DTMF recognition problem on SIP with AMI for bridge calls:
When both peer dtmfmode set to same value like “rfc2833” AMI cant detect anything.
I put a tshark on server and I can see dtmf packets coming (like ; RTP EVENT Payload type=RTP Event, DTMF Nine 9) but seems asterisk miss them.
When the dtmfmode values for bridge call ends are different it is working fine .

Thx

2

Have you BRI, PRI or FXO?

Are external or internal?

Bye
Davide

3

Hi,
All peers are softphones and ip-phones .

4

HI…

ok for phone but wich kind of line have you? Nornal Line (FXO), ISDN-Line (BRI) ore PRI?

Howevwer, you shoul check in your chan_dady.conf for dtmfmode.

Can you post your config file?

Bye

5

He may have an isolated system. Even if not, many, and probably most, uses use SIP and rely on an external provider to interface to the circuit switched network.

6

Hi,
Have you try to’ set dtmfmode=inband in SIP.conf?

Set it in general and in single user config

7

Hi All,
Thanks for replies.
I am sure it is not a problem by phone I tested with two softphone on PCs and problem is same.
during my troubleshooting I found out when I set “TtKk” in Dial command this problem gone.
so the history is :
[color=#FF0000]1- When 2 peers (101 - 102) on same dtmfmode which using Dial(SIP/102) Asterisk wont capture DTMF.[/color]
[color=#00BF00]2- When 2 peers (101 - 102) on same dtmfmode which using Dial(SIP/102,TtKk) is ok.
3- When 2 peers (101 - 102) on diff dtmfmode which using Dial(SIP/102) or Dial(SIP/102,TtKk) is ok.[/color]