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New Member

No Ringback across a T1

I have IP Phones, Call Manager 3.1 and a 3660 with a PRI for in/out calls and a T1 to an office that has IP Phones and a 3660.

When I call from an IP Phone to an IP phone at the office with the Call Manager, it works fine. When I call from an IP Phone to an IP Phone at the office on the other side of the T1, I don't hear ringback. It doesn't matter whether I am dialing the extension number or the whole outside number. The phone at the other end does ring, though.

Any suggestions?

New Member

Re: No Ringback across a T1

have you tried any of the progress_ind commands?

for example, without progress_ind setup enable 3 on this dial peer pstn callers do not get ringback from my 3640

dial-peer voice 3000 voip

destination-pattern 3...

progress_ind setup enable 3

session target ipv4:

dtmf-relay h245-alphanumeric

codec g711ulaw

you situation is a little different but...

New Member

Re: No Ringback across a T1

When the users answers can they speak to each other?

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