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New Member

Outside caller hears 3 rings before the Cisco phone rings

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?

10 REPLIES
Hall of Fame Super Gold

Re: Outside caller hears 3 rings before the Cisco phone rings

You did not specified any detail like type of line, configuration, system and version, protocol used.

New Member

Outside caller hears 3 rings before the Cisco phone rings

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

!

interface Serial0/1/0:15

description Dresden PSTN Access

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

trunk-group PSTN_ALL

no cdp enable

!

Hall of Fame Super Gold

Outside caller hears 3 rings before the Cisco phone rings

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".

New Member

Outside caller hears 3 rings before the Cisco phone rings

Hi Paolo,

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.

Hall of Fame Super Gold

Outside caller hears 3 rings before the Cisco phone rings

It's impossible to tell why without more information.

Anyway, in Germany you need isdn overlap-receiving configured.

New Member

Outside caller hears 3 rings before the Cisco phone rings

Why is that needed?  It looks like it would only serve to slow the call routing down further.

Hall of Fame Super Gold

Re: Outside caller hears 3 rings before the Cisco phone rings

Try calling from a phone at home, pause 1 or 2 secs in the last digits, and you will see why it is needed.

New Member

Outside caller hears 3 rings before the Cisco phone rings

Hi Paolo,

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?

Hall of Fame Super Gold

Re: Outside caller hears 3 rings before the Cisco phone rings

As mentioned above, one need to see the traces for a troubled call.

New Member

Re: Outside caller hears 3 rings before the Cisco phone rings

Paolo,

The missing piece was a timeout on the overlap receiving.  Here's what I did:

isdn overlap-receiving T302 5000

Thanks for your help!

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