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New Member

Vlan requirements

Hi,

I have a quick question......for applications such as CUPC / Jabber and Cisco Agent Desktop for UCCX.......does the data vlan that the PC running the applications need to be able to route directly to the IP Phone or is it just a requirement for the PCs to be able to route to the CUCM/UCCX/CUPS servers and then that server vlan route to the IP Phone.

I'd assume that the data & voice vlan need to be route to each other for jabber Deskphone control etc but would just like to confirm as I'm not in a position to test

Thanks

J

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VIP Super Bronze

Re: Vlan requirements

Data to Voice inter-VLAN routing is only required for softphones since the RTP media must make it over to the physical phone (and back). All other features are client to server in nature: Deskphone Control is CTI to CUCM, IM&P is XMPP to CUP, VVM is to Unity Connection, etc.

If your corporate security policy forbids easy access to the Voice VLAN you can use a Trusted Relay Point for the softphones. The TRP is just an MTP which acts as a proxy for the RTP media. It can be combined with IOS ZBFW to open pin holes for RTP media; or, be as simple as being permitted in an ACL. A second advantage to the TRP is that it can apply appropriate QoS markings if you do not want to trust or mark at the access layer for the Data VLAN.

One footnote: When Jabber adds CUVA-style deskphone video you would also need inter-VLAN routing access for the Cisco Audio Stream Tunnel (CAST) protocol and video RTP traffic. CAST works by seeing the IP of the phone through the PC's CDP driver and then connecting to the phone. When the phone makes/receives a call it uses CAST to get video SDP into the call but does not proxy the media. The CAST client (e.g. Jabber) sends/receives the video RTP from the Data VLAN while the phone sends/receives the audio from the Voice VLAN. TRP would only work here if you applied it to the deskphone which likely isn't desirable.

Please remember to rate helpful responses and identify helpful or correct answers.

4 REPLIES
Hall of Fame Super Gold

Vlan requirements

There is no need for anything to be in the same subnet/VLAN.

New Member

Vlan requirements

ok - I understand that.....but do the voice / data VLANs need to be able to route directly to each other? Basically the customer is implementing a new voice vlan for IP Phones and there is an issue with setting up routing between the two. I've told them that the data & voice vlan need to be able to se each other for UCCX & CUPC applications but just trying to confirm that this is a definite requirement. If the PC cannot route directly to the IP Phone will this cause an issue?

VIP Super Bronze

Re: Vlan requirements

Data to Voice inter-VLAN routing is only required for softphones since the RTP media must make it over to the physical phone (and back). All other features are client to server in nature: Deskphone Control is CTI to CUCM, IM&P is XMPP to CUP, VVM is to Unity Connection, etc.

If your corporate security policy forbids easy access to the Voice VLAN you can use a Trusted Relay Point for the softphones. The TRP is just an MTP which acts as a proxy for the RTP media. It can be combined with IOS ZBFW to open pin holes for RTP media; or, be as simple as being permitted in an ACL. A second advantage to the TRP is that it can apply appropriate QoS markings if you do not want to trust or mark at the access layer for the Data VLAN.

One footnote: When Jabber adds CUVA-style deskphone video you would also need inter-VLAN routing access for the Cisco Audio Stream Tunnel (CAST) protocol and video RTP traffic. CAST works by seeing the IP of the phone through the PC's CDP driver and then connecting to the phone. When the phone makes/receives a call it uses CAST to get video SDP into the call but does not proxy the media. The CAST client (e.g. Jabber) sends/receives the video RTP from the Data VLAN while the phone sends/receives the audio from the Voice VLAN. TRP would only work here if you applied it to the deskphone which likely isn't desirable.

Please remember to rate helpful responses and identify helpful or correct answers.

New Member

Re: Vlan requirements

Great Info - thanks. Exactly what is was after

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