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VVX400: problem answering when incomgin call on BLF

Occasional Contributor

VVX400: problem answering when incomgin call on BLF

Hi all,

We seem to have quite some issues with VVX400: our phones are configured with BLF to monitor the other lines in the company. Now, when a call comes in via a hunt grop, for example, my phone starts to ring but immediately I see messages about the same call being offered to the other phones. At that time, I cannot answer the call on my phone (no answer button, unhooking does not help). Sometimes it helps when I press Pickup.

So, to be clear: 1) when a direct call enters on my line: no problem

2) when a calls comes in on a colleagues phone, I see the message on my screen (due to BLF) and I can pickup the line

3) when a call comes in which is offered tu multiple phones at the same time, and my phone is one of that group, I regularly have issues answering the call.

We are using software version 4.1.6


Anyone encountered this already?

FYI: we are using provisioning files pushed by our Broadsoft-platform.

Message 1 of 3
Polycom Employee & Community Manager

Re: VVX400: problem answering when incomgin call on BLF

Hello pcools,

welcome back to the Polycom Community.

I would suggest you test the latest UCS 4.1.7 or even UCS 5.1.1 REV B first as they had some BLF enhancements,


In addition it would make more sense to re-design your groups as alerting multiple phones for the same call causes the phone having to track each individual SIP notify.


This may cause the phone's CPU to utilize to much power and will slow done other apsects of the phone.


A single shared line on each phone would be more appropriate for the same effect.

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 Poly 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.


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 2 of 3
Valued Contributor

Re: VVX400: problem answering when incomgin call on BLF

Hi pcools


Is the phone being answered by someone before you? This is more than likely the Broadsoft platform design.

The reason for this is that the Broadsoft platform don't want more then one device to sent RTP to the originator. This can happened if 2 or more devices answered with a 200OK at the same time(approx).


Hope this helps



Message 3 of 3