The implementation of SRV records in the SIP trunk communication between CUCM and IM&P is simple, but it is often confusing as the documentations does not explain it much. This document explains the integration with the help of screen shots, and I hope that this will help you in understanding the setup clearly.
FOr High Availability, it is advised to add multiple CUP servers in the destination address of SIP Trunk between CUCM and CUP. We can add upto 16 IP Addresses as SIP Trunk destination.
However many admins find SRV records to be a more convenient way. Also, we can use SRV to add CUCM Presence Gateway in IM&P server.
Jabber for Windows 9.7.1
But the same configuration is applicable for previous the versions of above clients
CONFIGURATIONS IN DNS SERVER
a) The first step is to create 2 DNS sub-domains under the main DNS domain - one for CUCM and one for CUP SRV.
In my lab, I created the subdomains as follows:
b) Now, we need to add the below SRV entries:
In my lab, the domains are
c) Verify from your network if the SRV's are resolvable. Also double check if DNS server details are added in the UC servers.
To resolve SRV from command prompt:
CONFIGURATIONS IN CUCM
a) Create the CUCM SIP Trunk towards IM&P server. In the destination address field, add the details as follows.
As you would have noticed, only the subdomain.domain should be added here. The CCM service prefixes _sip._tcp in the SRV request.
b) Save the Trunk and Reset. Now you would see the below request from the CUCM server in DNS server.
C) Add the SIP Trunk as IM and Presence Publish Trunk in CCM Service Parameter
Now the configuration in CUCM is complete.
CONFIGURATIONS IN IM&P SERVER
a) Presence --> Presence Gateway
Create a CUCM PRESENCE gateway, and as follows.
This configuration specifies the servers from where Phone presence is accepted. Please note that we should give the complete name of CUCM SRV record here.
b) Now in System --> Service Parameter, specify the SRV cluster name as follows.
This parameter should be configured with the CUP sub-domain.
The IM&P server caches the SRV information, and the Phone service was not affected while I brought down the DNS service. I have not done much tests though. The SRV information is updated when you reset the trunk.
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