Solved: Make sure any SIP Packet

eurtelepresence · ‎11-27-2015

Hello All,

We have a SX20 which behaves strange while someone shares/Present the content from remote location.

When the remote site shares the content first, The local site with Sx20 is not able to receive the content. To make it work, the SX20 site needs to share first and after that both sites can share the content without issue.

Having tough time in isolate the issue, we tried changing the cables and a factory reset, but nothing worked. Any help is much appreciated.

Software version: TC7.3.3.c84180a

Installed options: DualDisplay

HighDefinition

NaturalPresenter

Thank you

Wayne DeNardi · ‎11-29-2015

One way content is most often a firewall issue. Have you checked that the firewalls in between the two endpoints are configured corretcly to allow the media streams. WIth the fact that you can make it work by opening the ports up from one end, it sounds very much like there are some being blocked inbound.

Failing that, we'll need a few more details on the configurations at each end. Have you got details on what the the far end endpoint is? Is that another SX20, or something else? What call control mechanisms are in place at both ends (VCS, CUCM, Standalone)? What call protocol is being used (H.323 or SIP)?

Wayne
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Wayne

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View solution in original post

Wayne DeNardi · ‎11-29-2015

One way content is most often a firewall issue. Have you checked that the firewalls in between the two endpoints are configured corretcly to allow the media streams. WIth the fact that you can make it work by opening the ports up from one end, it sounds very much like there are some being blocked inbound.

Failing that, we'll need a few more details on the configurations at each end. Have you got details on what the the far end endpoint is? Is that another SX20, or something else? What call control mechanisms are in place at both ends (VCS, CUCM, Standalone)? What call protocol is being used (H.323 or SIP)?

Wayne
--
Please remember to rate responses and to mark your question as answered if appropriate.

Wayne

Please remember to mark helpful responses and to set your question as answered if appropriate.

eurtelepresence · ‎11-30-2015

Hello Wayne,

Thank you for your inputs, I had a test call few minutes back. I dont see any packet drops in the Firewall during the presentations on either way, still it doesn't work.

Remote rooms, I tried with several models, CTS3010, CTS9K Series, SX20, got the same response with all models

We use both, CUCM and VCS as well.

Protocol is SIP.

Wayne DeNardi · ‎04-04-2016

Make sure any SIP Packet Inspection / ALG fixup is also disabled on your firewalls too.

Wayne
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Please remember to rate responses and to mark your question as answered if appropriate.

Wayne

Please remember to mark helpful responses and to set your question as answered if appropriate.

Rodrigo Reyes · ‎03-23-2016

Wayne,

I agree that this is likely a firewall issue as I've run into it as well. Do you know where I can get a firewall configuration guide for TelePresence that shows ports/protocols that need to be opened?

Thanks in advance for the help.

Rodrigo

Patrick Sparkman · ‎03-24-2016

VCS IP Port Usage for Firewall Traversal Deployment Guide

Expressway IP Port Usage for Firewall Traversal Deployment Guide

Cisco (ex-TANDBERG) IP & SIP Firewall Ports

Rodrigo Reyes · ‎03-24-2016

Thank you Patrick!

SX20 Presentation issue