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Data and voice vlan separate; jabber question

Imagine organization has MPLS provider network for data.

Separate MPLS network for voice.

The voice CUCM, Unity  Conn and Presence servers are housed in the provider collocation facility connected via MPLS.

Site1 has a CUCM subscriber. Site has a MPLS CE router and a 6509 layer 3 switch and firewall blade.

Workstations are connected to switches associated with Data VLAN and traffic runs through the MPLS data networ.

CIsco IP phones are associated vlan 2, connected to a PoE layer 2 switch. Such switch is connected to the 6509 via fiber. 


Imagine PCs, which run connected to the data vlan need to run Jabber (chat IM) and view Presence information. Also dial phones from the Outlook thing.

How is the best practice in this case to let the PCs access presence, etc and other services which are running in the voice network?
Do you place any access list in the 6509 to allow traffic from vlan voice to be accessed from vlan data workstations?

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