I just installed a new Cisco Call Manager (replaced a Nortel) and the only complaint I have heard is that when someone calls from the PSTN to a person in the office the caller hears a ring back 3 to 4 times before the phone in the office rings. I can see the call hit my router as soon as the caller hears the first ringback. Is there soemthing I have to configure to speed the call to the desk phone?
You did not specified any detail like type of line, configuration, system and version, protocol used.
Sorry, you're right. I am using an E1 PRI on a 2901 connecting to Call Manager 8.6.2.
Here's the E1 config:
controller E1 0/1/0
pri-group timeslots 1-31
description Dresden PSTN Access
no ip address
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable
Seem like you have and H.323 configuration, you did not include the dial-perr configuration for CM, anyway you will need need to take "debug isdn q931" and "debug cch323 h225" with "term mon".
I'm not sure what the cause was, I have not changed anything, but the problem seems to have resolved. Could the system have needed some breaking in time? This was a new install and I posted this on day 1.
It's impossible to tell why without more information.
Anyway, in Germany you need isdn overlap-receiving configured.
Try calling from a phone at home, pause 1 or 2 secs in the last digits, and you will see why it is needed.
Thanks for the advice on for the overlap-receiving, that helped a bunch. I am still having a problem though with some inbound calls taking upward of 30 seconds to connect. The worst of it is that there is no ringback tone during that time so customers are thinking there is something wrong and hang up. Any advice for that?
The missing piece was a timeout on the overlap receiving. Here's what I did:
isdn overlap-receiving T302 5000
Thanks for your help!