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Lync Attendant can't transfer calls to VVX600

Occasional Contributor

Lync Attendant can't transfer calls to VVX600



We're unable to transfer calls from Lync Attendant (4.0.7577.4398) to a Polycom VVX600 device. The incoming call is put on hold, a second (consulting) call is made and once we click the blue transfer arrow in the second call the following message is shown:


Transferred conversation cannot return.

If the recipient does not answer, this conversation might not be returned to you. The caller uses software that does not support this. Unanswered calls will be routed according to the recipient's settings. You can turn this notification off in Options.


When i drag the first call into the second the following error shows up:


Connection not made: Call 2 to Call 1

Cannot connect the calls. An unkown error occurred. (ID: -2131820140)


This only happens when i try to transfer a call to someone signed into a VVX600 device. It works fine when the same user signs off the device and signs into a Sfb/Lync client on the computer.


Server backup is a Lync 2013 setup.


If i use a Lync client i can transfer calls to a VVX600 device just fine.


Is this a known issue, or can i somehow fix this?





Polycom Employee & Community Manager

Re: Lync Attendant can't transfer calls to VVX600

Hello Sebastian,

welcome to the Polycom Community.

It is always useful to include the currently used SIP or UC Software version as issues experienced may already be addressed in a newer release.

This also allows yourself and others to check against current software release notes.

The above is also stated in the "Read First: Welcome to the Polycom VoIP Forum"

Therefore the Polycom VoIP FAQ contains this post here:

Question: How can I find out my SIP UC Software Version or the BootROM Version of my Phone?
Resolution: Please check here


Are these external calls only and if yes what Gateway are you using and what software level on the gateway.

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. 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
Occasional Contributor

Re: Lync Attendant can't transfer calls to VVX600

Hi Steffen,


Thanks for your prompt reply.


It turned out to be a setting in Lync Attendent that caused this issue.


Disabling the setting "Return a transferred call to me if the recipient does not respond" makes it possible to transfer calls to a VVX device.





Message 3 of 3