Traversal and non-traversal calls

Answered Question
Jun 21st, 2012

Hi,

Can somebody explain in simple words what are traversal and non-traversal calls?, what is the difference? And also Does the VCS control below need traversal licenses?,

CTI-VCS-CONTRL-K9

VCS Control

Thanks in advance.

I have this problem too.
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Correct Answer by tomtanig about 1 year 10 months ago

If you have two C-series Endpoint (i.e. CTS-SX20) both registered on VCS Control and also Endpoint able to reach out directly each other (has routing), then in general the call will treat as non-traversal call, so no traversal license will be required.

However if those Endpoint calling each other but using different protocol (i.e. one Endpoint registered on VCS Control only with H323 and other Endpoint registered on VCS only with SIP), or different IP version (i.e one with IPv6 and other with IPv4 registration), then VCS Control will remain the media routing in order to handle such interworking scenario which will require traversal call license.

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Average Rating: 5 (3 ratings)
tomtanig Thu, 06/21/2012 - 07:42

On VCS Control…,

Non-Traversal Call: VCS only involve and take call signaling

Traversal Call: VCS involve both call signaling and media routing.

- Traversal Call between VCS-Expressway

- IPv4/IPv6 Interworking Call

- SIP/H323 Interworking Call

- B2BU Call (i.e. MS Lync integration)

etc.

tomtanig Thu, 06/21/2012 - 08:00

On VCS Expressway (just for additional reference)...,

Non-Traversal Call: VCS only involve and take call signaling

- SIP: call between SIP UA and both SIP UA’s have same sip contact address and source IP address

- SIP: call handle as ICE call

etc.

Traversal Call: VCS involve both call signaling and media routing.

- Traversal Call between VCS-Expressway

- IPv4/IPv6 Interworking Call

- SIP/H323 Interworking Call

- B2BU Call (i.e. MS Lync integration)

- SIP: Call between SIP UA and one or both of SIP UA’s sip contact address differs from source IP address

- H323: Call between H.323 Endpoint registered on VCS-E with either ASSENT or H.460 traversal capability.

etc.

jacinto1m Thu, 06/21/2012 - 08:04

If I have a VCS control and the call is between two telepresence end points:

CTS-SX20-PHD12X-K9SX20 Quick Set   HD  NPP    12xPHDCam  1 mic  remote cntrl

Do I need a traversal license?

Correct Answer
tomtanig Thu, 06/21/2012 - 08:13

If you have two C-series Endpoint (i.e. CTS-SX20) both registered on VCS Control and also Endpoint able to reach out directly each other (has routing), then in general the call will treat as non-traversal call, so no traversal license will be required.

However if those Endpoint calling each other but using different protocol (i.e. one Endpoint registered on VCS Control only with H323 and other Endpoint registered on VCS only with SIP), or different IP version (i.e one with IPv6 and other with IPv4 registration), then VCS Control will remain the media routing in order to handle such interworking scenario which will require traversal call license.

tomtanig Thu, 06/21/2012 - 17:13

Please note currently VCS Control ship with 100 traversal calls license as package. (This specification may change but as of today that is how packaging it).

RICHARD MESSINGER Mon, 10/29/2012 - 11:53

Which is used when a endpoint is registered to a VCSc and the call is going to a Video phone or other audio endpoint that is registered to a Call Manager and we have a SIP trunk between the VCSc and the Call Manager?

I am guessing it would be a Traversel license seat.

gubadman Mon, 10/29/2012 - 12:11

It depends a lot on set up. In our test labs they are usually non-traversal as the VCS is not taking media, just the signalling.

Thanks,
Guy

Sent from Cisco Technical Support iPad App

tomtanig Mon, 10/29/2012 - 21:37

> Which is used when an endpoint is registered to a VCSc and the call is going to a Video phone or other audio endpoint that is registered to a Call Manager and we have a SIP trunk between the VCSc and the Call Manager?

As Guy mention, this is very depend on configuration but main factor is search rule and priority.

VCS always try to setup the call with native call protocol first then fall back to interworking call but this will be following search rule priority as well.

If call establish via UCM (over SIP trunk), then call most probably establish as non-traversal call unless encryption policy is enabled on VCS (then call will go through B2BUA on VCS and treat as traversal call).

If call establish with Endpoint on VCS, then it depend on configuration and far end device registration protocol.

ddaoud001 Fri, 02/01/2013 - 13:35

If you have 0 non-traversal license will VC calls work for instance using jabber ?

tomtanig Fri, 02/01/2013 - 14:28

One VCS Expressway, VCS will use traversal call license to handle non-traversal call, if required.

For example, VCS-E has no non-traversal call license or already use all installed non-traversal call license with

existing active call, the new incoming non-traversal call will handle by consuming traversal call license (instead of disconnecting it because of non-traversal call license availability).

Please note, this is not true on VCS Control.

VCS Control will not handle non-traversal call by using traversal call license.

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