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SoundPoint IP 450: Line UnRegistered

Occasional Visitor

SoundPoint IP 450: Line UnRegistered

I have had issues with this phone for the past week. At first it was working fine...then for some reason stopped working and was in the constant state of rebooting. I was able to update the phone and I can get access to the main screen. But I still get it to be recognized by my PBX system. And the phone is shows an error message of LINE UNREGISTERED. I really have no clue how to provision it. I have read the instructions, but I am not a technicial person. How can I get it to work again, in the simplest of instructions. 

Message 1 of 3
Polycom Employee & Community Manager

Re: SoundPoint IP 450: Line UnRegistered

Hello CoolPool,

welcome to the Polycom Community.

The community's VoIP FAQ contains this post here:


Oct 7, 2011 Question: Can I register or is my Polycom Phone compatible with a “XYZ” SIP Server?

Resolution: Please check => here <=

Please ensure you always check the community FAQ and/or utilize the community search before posting any new topics or follow up post’s.

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
Occasional Visitor

Re: SoundPoint IP 450: Line UnRegistered

::Check your Port Number::

I recently had similar issues while setting up used IP450's and IP550's. The reason my lines would not register was because my phones had the wrong port number.


I found this note while setting up new CHAN_SIP extensions in my SIP server. "This device uses CHAN_SIP technology listening on Port 5160 (UDP - this is a NON STANDARD port)


After entering this port number into my phone manually, (MENU<SETTINGS<ADVANCED<ADMIN SETTINGS<LINE CONFIGURATION<LINE 1<SERVER 1<PORT<EDIT) my line registered immediately.


Hope this helps someone


Message 3 of 3