Channel selection order under ISDN E1 PRI

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Nov 27th, 2007
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We have the following VoIP setup:


Site1_PBX---VoIPgw--**network**--VoIPgw--Site2_PBX


ISDN type: E1 PRI


Both gateways have 03 E1 PRI setup, so total, we have 90 B channels. It seems the router select the B channel randomly.

We need to have a logical sequence of B selection for each gateway:

First E1 will be selected and B channel will be selected from 1 to 30 sequencially

the second E1 will be selected once the first e1 is fully used (all 30 B channels are used) and B channel will be selected from 1 to 30 sequencially

the third E1 will be selected once the first and the second e1 is fully used (all 30 B channels are used) and B channel will be selected from 1 to 30 sequencially



Thanks for your quick feedback as this is urgent for users


Mohamed

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Paolo Bevilacqua Tue, 11/27/2007 - 07:11
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Hi,


No the router does not select B-channel at random. It always uses ascending or descending order. To have an order whitin the different interfaces, configure them in a sequential trunk-group.


Hope this helps, please rate post if it does!

total-cisco-smartnet Tue, 11/27/2007 - 07:23
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hello,

Thanks for your response.


Do you have any related documentation about trunk-group?

Which Cisco IOS command should i use?

Appreciate your help


Paolo Bevilacqua Tue, 11/27/2007 - 09:05
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Hi,


Under serial x/y interface, specify a trunk-group with a name of your liking, and a priority if necessary.

Under DP pots, specify the same trunkgroup instead of port.

Optionally, under "trunk group ", you can configure additional options.


That's it.


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