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IM & Presence SRV Records

KRISHNA K V
Beginner
Beginner

We have two IM & Presence Server and will be using Jabber clients. I would like to knwo about the SRV records configuration for this setup.

in the jabber deployment guide its mentioned as follows.

cuplogin._tcp.company.com
Server: dns_server.company.com
Address: 10.10.1.10
_cuplogin._tcp.company.com SRV service location:
 priority =0
 weight =0
 port =8443
 srv hostname =cupserver.company.com
 internet address =10.53.56.57

In the preceding example, _cuplogin is the service name. The presence server domain name is company.com. The SRV record defined in the DNS server for the company.com domain is _cuplogin._tcp.company.com.

In the above example its pointing only to one presence server. If we have two presence server do we need to crate one more srv record for the second server?

Since presene is in a cluster is cluster SRV record is mandatory for CUCM and presence communications.

Krishna.

6 Replies 6

Chris Deren
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Correct, you want to built 2 of these entries pointing equally to both of your IMP servers, basically make the priority and weight the same. One clarification here is that the Internet address should be of your IMP servers (the filed is called "host offering this service" when AD)

HTH,

Chris

Dear Chris,

Abouat this line below:

Address: 10.10.1.10

is it DNS server IP or what?

That is the IP address of your DNS server.

HTH, please rate all useful posts!

Chris

j-lehmann
Enthusiast
Enthusiast

Hi,

we have now 2 SRV for cuplogin but was is that meaning

"Since presene is in a cluster is cluster SRV record is mandatory for CUCM and presence communications."

Need I additional SRV for the communication between CUCM and CUPS and vice versa, I have never read that.

hanks to clarify that

joerg

Joerg,

I assume this is the section regarding the SIP trunk configuration requirement in the CUPS deployment guide?  If so this SRV record is optional for adding redundancy to the "On the Phone" status for users.  Call Manager has a one way SIP trunk to CUPS to push this phone status and can optionally be configured in two ways:

1) With an SRV record which has one entry per CUPS nodes

2) With multiple IP addresses (the later version of Call Manager allow you to add multiple IP destinations on a single SIP trunk.  I believe this started around CUCM 8.6 but I'm not positive).

So with either configuration you can ensure that if one of your CUPS servers are down you can still see "on the phone" status.  That is what the purpose of this SRV is.

Regards,

Jason

Thanks Jason,

Base on the information what I found in the forum over the weekend I create the following SRV

Jabber Client Login
_cuplogin._tcp.example.com   SRV service location:
           priority       = 0
           weight         = 0
           port           = 8443
           svr hostname   = cups-sub.example.com


_cuplogin._tcp.example.com   SRV service location:
           priority       = 0
           weight         = 0
           port           = 8443
           svr hostname   = cups-pub. example.com

CUCM to CUPS

_sip._tcp.presence.example.com       SRV service location:
           priority       = 10
           weight         = 0
           port           = 5060
           svr hostname   = vCUPSub1. example.com

_sip._tcp.presence. example.com       SRV service location:
           priority       = 10
           weight         = 0
           port           = 5060
           svr hostname   = vCUPPub1. example.com

CUPS to CUCM

_sip._tcp.CUCM.example.com       SRV service location:
           priority       = 10
           weight         = 0
           port           = 5060
           svr hostname   = vCUCMPub1.example.com

_sip._tcp.CUCM.example.com       SRV service location:
           priority       = 10
           weight         = 0
           port           = 5060
           svr hostname   = vCUCMSub1.example.com

But there is also a CUCM bug CSCth25928. CUCM is not able to use the second entry in the SRV. IS still not resolved but there is a work-a-round

regards

joerg

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