Delayed outgoing dial tone

[mcastle]

We have been having intermittent issues with only a certain group of phones having delayed outgoing calls. The dial tone starts ringing after 30 seconds or doesn't at all. What could be the cause of this or where can I begin trouble shooting this issue? We use SIP trunking through comcast, with our mitel 3300. Any suggestions?

[VinceWhirlwind]

30 seconds sounds like too long to be inter-digit timeout, but you should rule that out first. Check which Digits Dialled the outgoing call is matching and make sure it is an exact match rather than n+unknown.

[mcastle]

30 seconds sounds like too long to be inter-digit timeout, but you should rule that out first. Check which Digits Dialled the outgoing call is matching and make sure it is an exact match rather than n+unknown.

Digits dial are 9 follow by 7, no unknown numbers, if calling within the area code. Outside local area code they must dial 91 + 10, the inter digit timer is set to 10 seconds