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SIP Trunks with major carrier

We utilize ATT MPLS (MIS) network and I'm looking into possible solutions using a SIP trunk for each office location worlwide. We currently have one or multiple PRI's at each location. We are running Call Mgr 4.1.3 SR6 with H323 gateways. What are the benefits with the SIP trunks? Can you do least cost routing with SIP trunks? What are the difficulties/known issues with SIP trunks (ie. ATT solutions). Any other info is appreciates

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Re: SIP Trunks with major carrier

I think you can achive lease cost route through SIP trunk. You must also configure route groups and route patterns that use the SIP trunks to route the SIP calls.

For more info:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/5_0_1/ccmsys/a08trnk.html#wp1092063

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