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Caller hears 2 ringbacks before IP Phone rings

mreed
Beginner
Beginner

I have centrex phone lines connected to FXO ports at one of my remote sites. When someone calls in they hear two ringback on their phone before the IP Phone starts ringing. I need to shorten the discrepency in the ringing. I don't expect it to by syncronized but I know it can be closer. I'm running H323, using CallManager 3.3(4) and running SRST on the router. I've include the relevent part of my config.

Any help would be greatly appriciated.

voice class h323 1

h225 timeout tcp establish 3

!

no voice hpi capture buffer

no voice hpi capture destination

!

!

interface FastEthernet0/0

ip address 172.26.147.4 255.255.255.0

h323-gateway voip interface

h323-gateway voip bind srcaddr 172.26.147.4

!

voice-port 1/0/0

input gain 6

echo-cancel coverage 32

connection plar opx 44700

caller-id enable

!

voice-port 1/0/1

input gain 6

echo-cancel coverage 32

connection plar opx 44700

caller-id enable

!

voice-port 1/0/2

!

voice-port 1/0/3

!

dial-peer cor custom

!

!

!

dial-peer voice 1000 voip

preference 1

destination-pattern 4....

voice-class h323 1

session target ipv4:172.16.9.40

dtmf-relay h245-alphanumeric

codec g711ulaw

!

dial-peer voice 1001 voip

preference 2

destination-pattern 4....

voice-class h323 1

session target ipv4:172.16.9.41

dtmf-relay h245-alphanumeric

codec g711ulaw

!

!

1 Reply 1

jasyoung
Rising star
Rising star

The router is waiting for caller ID information, which on FXO is delivered between the first and second rings. After it receives (or doesn't receive) caller ID, it goes ahead and extends the call to the destination.

If you're willing to sacrifice caller ID, you can set "no caller-id enable" on your voice-ports, but if you need caller ID, this is basically something you just get to deal with. It's not Cisco-specific, that's just the way caller ID works on POTS lines.

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