I have a problem with DTMF dialling when in conjunction with a Grandstream SIP phone.
Problem: My SIP phone is set to 'early send' (coz I don't like waiting too long after dialling!)...
I want to dial a long series of DTMF carrier access digits before the digits dialled from the phone itself. i.e. 1411877xxxxxxx where xxxxxxx is the number I want to dial.
My dial string looks like this:
exten => _901.,1,Dial(${TRUNK}/1411877${EXTEN:1})
exten => _901.,2,CongestionListening via a hi-z monitor I hear the digits 1411877012 going to line, and then things start to go wrong, as Asterisk does not seem to correctly buffer digits being dialled. This means that unless I wait for the bulk of the digits to get sent, Asterisk loses track of where it is, and I lose a bunch of digits completely.
In contrast, overlap sending (which is in effect what I am doing) works fine on my E1 PRI.
Any suggestions please?
Rgds Tim
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