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BLF issues.


BLF issues.

Hello Community!


I'm having an issue whereby, we register the phone to a load balancer, this then assigns a sip server from a pool of 4 servers - all of which has presence enabled.


If I register to a specifc sip server,  I can receive status updates through presence about other phones on our network on my VVX310 . But, if I point at the load balancer, then I cannot receive updates like - phone ringing, phone busy etc


Do you know, why this might happen, only for Polycom phones, and no others (Snom, Yealink, Grandstream etc....)?


Many many thanks!



Message 1 of 3

Re: BLF issues.

Just to add to this, the line keys monitoring other extensions, are monitoing for a specific amount of time, then it seems like they're timing out. I  think this is to do with DNS settings on the phone, but still haven't worked out how to configure the VVX310 to keep this registration and not poll for a new one, therefore breaking the presence relationship.


Any help would be great, even just a hint at where to start looking.


Cheers, Joe

Message 2 of 3
Polycom Employee & Community Manager

Re: BLF issues.

Hello joethejones,


  • Settings > Logging > Global Settings > Global Log Level Limit > Set to DEBUG
  • Settings > Logging > Module Log Level Limits > DNS > Set to DEBUG
  • Settings > Logging > Module Log Level Limits > SIP > Set to DEBUG

Ensure your FTP / HTTP Server allows to append the logs and ensure the Upload Append Size Limit (Kbytes) is set to at least a couple of megabytes.


Siphon Networks Ltd would be your Tier 1 support contact.

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

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. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.


Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
Message 3 of 3