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The HP Community is where owners of HP products, like you, volunteer to help each other find solutions.
HP Recommended

I just bought a Soundpoint 335 for my one line home office.  I have comcast voice modem, and a dlink dir-655 router.  When I connected the 335 into the router LAN port, the phone initialized, I have a dial tone, but the phone will not register.  I also connected directly into the modem, same results.  I have adjusted the router's SIP settings, (SIP ALG, enable SIP, etc) to no avail.  Will this phone even work over Comcast's voice?

2 REPLIES 2
HP Recommended

Hello Rumbotim,

welcome to the Polycom Community.

 

Registration happens via port 5060

The community's VoIP FAQ contains this post here:

 

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

Resolution: Please check => here <=


The above post can be utilize to troubleshoot such issues.


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

------------------------------------------------
Notice: I am an HP Poly employee but all replies within the community are done as a volunteer outside of my day role. This community forum is not an official HP Poly support resource, thus responses from HP Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
If you need immediate and/or official assistance for former Poly\Plantronics\Polycom please open a service ticket through your support channels
For HP products please check HP Support.

Please also ensure you always check the General VoIP , Video Endpoint , UC Platform (Microsoft) , PSTN
HP Recommended

Hi Rumbotim,

 

As Steffen said, please try using wireshark to capture the traffic, ideally between the router and the modem, so you can see what's being sent and received, and this will show if the router is mangling the traffic in a way that is causing the registration to fail.

 

The DIR-655 includes "SPI firewall" functionality, and you may find that disabling this will allow your phone to register.

 

Alternatively installing OpenWRT on your router (if it is a supported revision) may also help, since the stock D-link firmware can cause issues with SIP registration.

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