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VVX 400 International +x country code dialing issue with Skype For Business

Occasional Visitor

VVX 400 International +x country code dialing issue with Skype For Business

We run into an issue with the VVX 400 when dialing including the country code.

If I stay off hook and dial the complete number using +1 (xxx) xxx-xxxx it works just fine

(bear in mind this means hitting ** to get the plus)

When I lift the horn and dial the same number it fails and appears to dial **1 (xxx) xxx-xxxx instead

The same applies when trying this using the speaker.


We only use the VVX 400 in our conference rooms (using Skype for Business) and use Skype for business on our laptops elsewhere.

As a global company we don't want to use 011 in the US and 00 in other countries but use the universal +(country code) instead.

Is there a way to configure this on the VVX 400 still to work after you lift the horn?  

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Polycom Employee & Community Manager

Re: VVX 400 International +x country code dialing issue with Skype For Business

Hello @Cort,

welcome to the Polycom Community.

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

This also allows yourself and others to check against current software release notes, Administrator Guides or FAQ post’s.

The above is also stated in the "Must Read First" and is the absolute minimum requirement every new post should include. .

In addition providing us with this basic information gives Polycom an idea what Software Versions are used in the field and avoids wasting time trying to troubleshoot issues which have already been addressed.

Therefore the Polycom VoIP FAQ contains this post here:

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


In addition would the S4B server not work out the digitmap ?


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. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.


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 2