i’m facing with an issue on dtmf detection on mu solution. first of all, let me describe my topology;
- i’m using a kamailio as load balancer having a sip trunk to a GSM/LTE network
- behind the kamailio i have 2 asterisks installed on version 16
- the network DTMF mode is inband. so, i’ve changed my dtmf mode from rfc2833 to inband mode in sip.conf
when i dial the IVR and input any range of digits with any speed and delay, there is no problem and asterisk detects the digits properly (for example: 123456789)
the issue is when I input duplicated digits. for example 123344567. in these cases, asterisk detects 1234567. also in some few cases asterisk ignore the duplicated digits. in my example: it detects 12567.
i’m really confused.
i appreciate if somebody help me in this case.