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SPIP 335 incoming voice garbled/clipped

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SPIP 335 incoming voice garbled/clipped

I hope this is the correct area for this post.


I tried searching to no avail, here is my issue:


I have a small network setup of about 35 SPIP 335's and a few Cisco VOIP phones. Recently, the 335's are exhibiting call garbling/clipping on every call consistently. The Cisco's work fine. We thought initially it was with the path to the provider (RingCentral), but that has ample bandwidth. Since we discovered the Cisco phones work fine, we are wondering if there is something we could configure on the 335's to mitigate the issue. Each phone has a PC connected to the passthrough port/hub. there is a Sonicwall router connected to two static IP broadband providers (different companies) for failover. We had configured the Sonicwall for QoS and Bandwidth management, but disabled that as it made the situation worse.


Please let me know if more information is needed, and thank you in advance for any help you can provide.


Any help would be appreciated - my client is ready to go back to PBX and take this account with him :)

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Polycom Employee & Community Manager

Re: SPIP 335 incoming voice garbled/clipped

Hello PCdot,

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


In addition are these only incoming calls or also internal calls?


I would guess that it may be related to a certain codec and can only recommend to check this:


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

Resolution: Please check => here <=


The above has some examples on how to troubleshoot and comparing the good and the bad calls may help you.


The next step would be to contact the Polycom reseller so they can open a support ticket with our team or if outside warranty a Pay Per Incident ticket.

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
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