SIP Registration process and DNS

kspittman · ‎12-08-2025

Hello,

I am looking for some info on how Poly E300 deals with missed Registrations and DNS requests.

DNS -

The phone seems to send a DNS request for each Registration.

What does the phone do in the event that the DNS request is not answered.

How many times will it request before time-out?

If it times out, does it use the addresses cached?

If so is there a limit/timeout to using the cached info?

SIP REGISTER -

If the phone does not receive a reply to a REGISTER request, how many times and what intervals will it try to REGISTER?

At what point (how many attemps) will it timeout and be unregistered?

Will it periodically try or will it wait until the REGISTRATION timer has expired?

Thank you in advance for your insight and help.

SteffenBaierUK · ‎12-08-2025

Hello @kspittman ,

Welcome back to the HP Poly community.

What was the outcome of your older post >here<?

Is this about Failover and routing? If yes please check >here<

Also ensure you always check our VoIP FAQ >here<

If no other volunteers reply, I suggest you contact our Support organization in your region. Details are in my Signature.

Best Regards

Steffen Baier

------------------------------------------------
Notice: I am an HP Poly employee but all replies within the community are done as a volunteer outside of my day role. This community forum is not an official HP Poly support resource, thus responses from HP Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
If you need immediate and/or official assistance for former Poly\Plantronics\Polycom please open a service ticket through your support channels
For HP products please check HP Support.

Please also ensure you always check the General VoIP , Video Endpoint , UC Platform (Microsoft) , PSTN

Create an account on the HP Community to personalize your profile and ask a question