Question on DNS entries for the grouping and the call

Hey all,.

We test a bunch of highway that has been placed in its own subdomian DNS (for example)

cluster.Domaine.com

With DNS entries:

SRV

_sips._tcp.cluster.domain.com. 86400 IN SRV 5061 1 1 Expressway1.cluster.domain.com.

_sips._tcp.cluster.domain.com. 86400 IN SRV 5061 1 1 Expressway2.cluster.domain.com.

_sip._tcp.cluster.domain.com. 86400 IN SRV 1 1 5060 Expressway1.cluster.domain.com.

_sip._tcp.cluster.domain.com. 86400 IN SRV 1 1 5060 Expressway2.cluster.domain.com.

_h323ls._udp.cluster.domain.com. 86400 IN SRV 1 1 1719 Expressway1.cluster.domain.com.

_h323ls._udp.cluster.domain.com. 86400 IN SRV 1 1 1719 Expressway2.cluster.domain.com.

_h323cs._tcp.cluster.domain.com. 86400 IN SRV 1 1 1720 Expressway1.cluster.domain.com.

_h323cs._tcp.cluster.domain.com. 86400 IN SRV 1 1 1720 Expressway2.cluster.domain.com.

_h323rs._udp.cluster.domain.com. 86400 IN SRV 1 1 1719 Expressway1.cluster.domain.com.

_h323rs._udp.clusterdomain.com. 86400 IN SRV 1 1 1719 Expressway2.cluster.domain.com.

A

Expressway1.cluster.domain.com. IN a x.x.x.x (address IP Expressway1)

Expressway2.cluster.domain.com. IN a x.x.x.x (address IP of Expressway2)

However, I would actual calls placed to the root domain

domain.com

But with these entries DNS pointing to the subdomain of cluster, or I point to the individual counterparts of the cluster (see above). My feeling is that what I should do to the cluster so I need update DNS entries for the main domain if the peer of the cluster changes, such as:

SRV

_sips._tcp.domain.com. Cluster.Domaine.com IN SRV 0 0 5061 3600.

_sip._tcp.domain.com. Cluster.Domaine.com IN SRV 0 0 5060 3600.

But is this correct?

Post edited by: Chris Swinney

Comment added to records showing that they point to

Hi Chris, how are you?

If I remember correct SRV RFC which would be an error because no recursive search of srv would get,

the address at the end of the srv record must be an a record (so also no CNAME).

In your scenario, you can use:

_sips._tcp.domain.com. 86400 IN SRV 5061 1 1 Expressway1.cluster.domain.com.

_sips._tcp.domain.com. 86400 IN SRV 5061 1 1 Expressway2.cluster.domain.com.

_sip._tcp.domain.com. 86400 IN SRV 1 1 5060 Expressway1.cluster.domain.com.

_sip._tcp.domain.com. 86400 IN SRV 1 1 5060 Expressway2.cluster.domain.com.

_h323ls._udp.domain.com. 86400 IN SRV 1 1 1719 Expressway1.cluster.domain.com.

_h323ls._udp.domain.com. 86400 IN SRV 1 1 1719 Expressway2.cluster.domain.com.

_h323cs._tcp.domain.com. 86400 IN SRV 1 1 1720 Expressway1.cluster.domain.com.

_h323cs._tcp.domain.com. 86400 IN SRV 1 1 1720 Expressway2.cluster.domain.com.

_h323rs._udp.domain.com. 86400 IN SRV 1 1 1719 Expressway1.cluster.domain.com.

_h323rs._udp.domain.com. 86400 IN SRV 1 1 1719 Expressway2.cluster.domain.com.

h323cs and rs cannot be used (cs is if you dial the field directly without user @ from the beginning)

RS is used for registration, most of the configurations that I saw live fine without it...

BTW, if it is a copy paste, replace your alone there is an error in the last entry of rs, it lacks one. between the two

cluster and field.

Btw2, I would set a record also has to be cluster.domaine.com at least one of the VCS, it's

very convenient for endpoints no or wrong to support srv records.

Tags: Cisco Support

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