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Issue between GS (and VBP 7501) and HDX (with DMA and VBP 4555)

Occasional Contributor

Issue between GS (and VBP 7501) and HDX (with DMA and VBP 4555)

Hi guys,


we have setup a new envorioment in our London office using a VBP 7501 (as embedded gatekeeper) and two end-point:


- GroupSeries 500 (using E164 4001)

- GroupSeries 700 (using E164 4002)


the VBP has it own public IP directly on the internet


In Rome we have a VBP 4555 (using Polycom DMA 7000 as gatekeeper) with it own public IP directly on Internet, DMA 7000 as gatekeeper (and use VBP as H323 SBC for internet call), RMX 1500 attached to DMA 7000 and various end-point, most of them are HDX 6000 and 7000


Now the problem is when we make a call directly between the end-point, from the Rome site we can see and ear the London office, but they don't see and ear us. Nothing change if the try to call directly us using the usual IP##E164, we see but on the other side no


The only way to have a two-way audio\video is to use RMX1500 (that pass from the same VBP) with a meeting room, Lodon call a meeting room inside the RMX and we from Rome call the same and everything is fine.


So I can assume that the problem is not VBP, but seems like and issue of codec (may be) between the HDX and GS endpoint. Has anyone had the same problem? The London site can call other endpoint without problem, just our Rome site :(


Any suggestion it's appreciated.


I'm attaching two network diagram from both office.




Polycom Employee & Community Manager

Re: Issue between GS (and VBP 7501) and HDX (with DMA and VBP 4555)

Hello Giammarco,

welcome to the Polycom Community.

It is always useful to include the currently used 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 "Read First"

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. 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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Occasional Contributor

Re: Issue between GS (and VBP 7501) and HDX (with DMA and VBP 4555)



Polycom RSM 9.0.1_12

Polycom DMA 6.3.2 P1

Polycom VBP 4555 11.2.24

Polycom VBP 7301 14.7.1

Polycom GS 700 6.0.0-280932

Polycom RMX 1500

Polycom HDX7000/6000  3.1.11-53024



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