Soundpoint IP450 Registers but says there's no network connection.


Soundpoint IP450 Registers but says there's no network connection.

I have a Soundpoint IP450 that works perfectly in my office. I moved it to a different location, on a different network and it would register all lines and receive inbound calls but had no dial tone, would not dial out and had said "Network is down".


I brought the phone back to my office and it works fine here again.


I've had this happen twice on two different networks.


Any ideas on what's happening and how to fix it?




Message 1 of 3
Polycom Employee & Community Manager

Re: Soundpoint IP450 Registers but says there's no network connection.

Hello Greg,

welcome to the Polycom Community.


The phone actually generates its own Dial Tone aka going off hook even if the Phone is not even registered to a server as you could dial an URL / IP Address.


Therefore some of the terminology used in your above post may not be 100% accurate.


Using a phone in a different network requires this network or the firewall to be aware that certain ports need to be open and forwarded to your phone.

The community's VoIP FAQ contains this post here:


Jan 21, 2014 Question: What Ports / Protocols are being used / need to be open in a Firewall?

Resolution: Please check => here <=


The above outlines these ports and if you or your IT Team want to assist you to troubleshoot this you can also have a look at:


Jan 19, 2012 Question: How to troubleshoot Polycom VoIP related Issues?

Resolution: Please check => here <=

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


If official support is required please check how to phone or open a case here

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

Re: Soundpoint IP450 Registers but says there's no network connection.

Hi Steffen,


Thank you for your reply. I'll look at the port list you included next time.


I'm aware that it generates it's own dial tone, that's what is so weird. In the scenario I described there was no dial tone. I could not make a call out of any sort. The phone is programmed to dial my voice mail using IP, that did not work at that time either.


Thanks again!


Message 3 of 3