Configure H.323 and CCM Fallback (SRST) for Overlap Sending

Answered Question
Mar 22nd, 2007

Dear Community,

I did configure the CallManager (4.2(3)) to dial out via overlap sending (Route Pattern: 0.00! "allow overlap sending" ticked). And the gateway 12.4(8)c as...

voice service voip

h323

h225 timeout t302 15

h225 signal overlap

modem passthrough nse codec g711alaw

dial-peer voice 1000 pots

destination-pattern 0

This works fine as long as the phones are registered to the CallManager, but stops working as soon as the phones get into fallback mode. In Fallback mode, only one digit "0" is send out and does not accept further digits.

But as soon as I configure the destination pattern as...

destination-pattern 0T

... dialing works in Fallback mode, but overlap sending not anymore in normal operation, as the destination pattern is waiting for the remaining numbers :(

Does anyone know how to configure the destination pattern to work as overlap sending in both modes?

Cheers

Roland

Correct Answer by msolak about 9 years 11 months ago

roland,

overlap sending does not work with a route patter 0.00!. A "!" always waits for an interdigit timeout.

in srst mode gateways does not provide overlap sending. therefore you must configure 2 dial-peers on the gateway. First pots dial-peer for ccm (destination-pattern = 0) to send the dialed digits in overlap and second pots dial-peeer (destination-pattern = 0T) only for srst mode. To avoid matching of the first dial-peer in srst mode you must add cor (class of restriction) in your srst and dial-peer configuration.

regards

mehmet

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drolemc Wed, 03/28/2007 - 11:40

move the routing decision to the CCM to overide IOS gateway dial-peer decisions.

Correct Answer
msolak Wed, 03/28/2007 - 15:17

roland,

overlap sending does not work with a route patter 0.00!. A "!" always waits for an interdigit timeout.

in srst mode gateways does not provide overlap sending. therefore you must configure 2 dial-peers on the gateway. First pots dial-peer for ccm (destination-pattern = 0) to send the dialed digits in overlap and second pots dial-peeer (destination-pattern = 0T) only for srst mode. To avoid matching of the first dial-peer in srst mode you must add cor (class of restriction) in your srst and dial-peer configuration.

regards

mehmet

jconi Wed, 04/04/2007 - 01:21

Just for your infos, I already configure Overlap Sending with H323, and you need to configure your destination-pattern like the following:

destination-pattern 0.

because destination-pattern 0 won't work

Maybe it was a problem on the IOS...

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