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Oddity using DNS SRV with TCP on UCS 4.0.1 firmware

joshelson
Occasional Contributor

Oddity using DNS SRV with TCP on UCS 4.0.1 firmware

I am experiencing some strange behavior with UCS 4 and using SIP over TCP with DNS-SRV.

 

If I put in the following:

 

line 1 server address = my srv address

line 1 transport type = DNSnaptr

 

and SIP server:

 

server 1 server address = my srv address

server 1 transport type = DNSnaptr

 

The phone refuses to register with my SRV.  I see it attempting to look up UDP, with this error in the logs:

 

1018010353|sip  |4|03|doDnsListLookup(udp): doDnsSrvLookupForARecordList 'my.srv.address' found no records

 

If I switch this slightly, to:

 

line 1 server address = my srv address

line 1 transport type = TCPPreferred

 

and SIP server:

 

server 1 server address = my srv address

server 1 transport type = DNSnaptr

 

Everything seems to work normally (including a form of failover/failback), althouth the logs still complain about not finding any records on a UDP lookup.

 

Any ideas on why this behaves this way?

 

 

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1 REPLY 1
SteffenBaierUK
Polycom Employee & Community Manager

Re: Oddity using DNS SRV with TCP on UCS 4.0.1 firmware

Hello joshelson,

 

please include the Phone model you are testing these features in the future as the separate models run different operating systems and may behave differently.

 

In addition UCS 4.0.1 has been outdated with UCS 4.0.3 Rev F

 

I am unsure why you would use the SIP Parameter voIpProt.server.x.address in addition with the Line Parameter  reg.x.server.y.address together.

 

Due not seeing the rest of the configuration I cannot really comment on your issue.

 

The Technical Bulletin 5844 => here <= gives as an example for a fallback server as:

 

reg.1.server.1.address="voipserver.serviceprovider.com"

reg.1.server.2.address=172.23.0.1

 

As already advised in your previous post => here <= if support is required you should really contact your reseller.

 

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

Polycom Global Services

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The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.

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