Trunk between different CME

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Feb 6th, 2009
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Hi to all, I want to submit a question about configuration:

I have in my office a CME on 2811 (it make also FW), and I have also a lot of customer with CME or UC520.

I want that when my customer call my number the voice go on xDSL and not on PSTN from its CME to my CME, I think I have to make a SIP trunk or what?

Do you have any documents to suggest. (all the hardware is cisco)

Thank a lot


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Overall Rating: 5 (1 ratings)
paolo bevilacqua Fri, 02/06/2009 - 07:19
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Most features work better with h.323, and you would use voip DPs. It's explained in cme srnd.

Nicholas Matthews Fri, 02/06/2009 - 07:34
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Hi Augusto,

Your primary concern will be making sure that you do not have any overlapping dial plans. From there, it is very easy.

You can use H323 or SIP, as CME doesn't get too complex and either one should work fine.

A sample configuration would look like this. This is assuming Site 1 has numbers 1000-1999 and Site 2 has 2000-2999

Site 1:

dial-peer voice 1

destination-pattern 2...

session target ipv4:

dtmf-relay h245-alpha

codec g711u

no vad

incoming called-number .

Site 2:

dial-peer voice 1

destination-pattern 1...

session target ipv4:

dtmf-relay h245-alpha

codec g711u

no vad

incoming called-number .

You may also want to add this configuration to both sides:

voice service voip

allow-connections h323 to sip

allow-connections sip to h323

no supplementary-service h450.2

no supplementary-service h450.3

And on both sides, choose the interface they will use to talk.

Use this interface level command:

interface fa0/0

h323-gateway bind source-address



a.crippa Fri, 02/06/2009 - 08:21
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Thank a lot it seem easy.

An other question about it, on each firewall I have to open UDP 8766-35000 for RTP and TCP 1720 for H.323 and 5060-5070 for SIP, right?

Thank you



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