SIP Trunk Destination in CUCM 8.5.1

[scottsassin]

We have created a sip trunk in our CUCM 8.5.1.  In the section SIP Informaiton, there is a destination box.  1* is required ip address and port.  To the right of this is a + button, that adds a new destination address and port destination.  How is this second one used?  Is it a round robin, or is it use 1* till 1* fails, then fail over to 2?

[acampbell · Accepted solution]

Hi,

Please read this from the 8.5.1 Admin guide

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_5_1/ccmcfg/b06trunk.html#wp1248116

SIP Information

Destination Address

The Destination Address represents the remote SIP peer with which this trunk will communicate. The allowed values for this field specify a fully qualified domain name (FQDN), or DNS SRV record only if the Destination Address is an SRV field is checked. Tip For SIP trunks that can support IPv6 or IPv6 and IPv4 (dual-stack mode), configure the Destination Address IPv6 field in addition to the Destination Address field. Note SIP trunks only accept incoming requests from the configured Destination Address and the specified incoming port that is specified in the SIP Trunk Security Profile that is associated with this trunk. Note For configuring SIP trunks when you have multiple device pools in a cluster, you must configure a destination address that is a DNS SRV destination port. Enter the name of a DNS SRV port for the Destination Address and check the Destination Address is an SRV Destination Port check box. If the remote end is a Cisco Unified Communications Manager cluster, DNS SRV represents the recommended choice for this field. The DNS SRV record should include all Cisco Unified Communications Managers within the cluster. When you configure multiple destination addresses, be aware of the following information: •When an outbound call gets placed, a destination address gets chosen randomly. No preference is given to one destination address over another. All SIP messages that are sent out for a given outbound call go to the same destination address. •The SIP trunk accepts inbound messages from any of the configured destination addresses.

HTH

Alex