Cisco Cisco Expressway
The basic configuration environment consists of the following elements:
Lync deployment with:
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a pool of Front End Processors with FQDN feppool.ciscotp.com
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a pool of Directors with FQDN dirpool.ciscotp.com
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an Edge server with FQDN lyncedge.ciscotp.com
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users david.jones@ciscotp.com and alice.parkes@ciscotp.com (among others)
Cisco video deployment with:
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Lync gateway Cisco Expressway-C (referred to as the "Lync gateway" Expressway) with peer FQDN
exp01.ciscotp.com and cluster FQDN lyncexp.ciscotp.com. The cluster FQDN must resolve to a list of
DNS A-records including the IP addresses of all cluster peers (for round-robin operation).
exp01.ciscotp.com and cluster FQDN lyncexp.ciscotp.com. The cluster FQDN must resolve to a list of
DNS A-records including the IP addresses of all cluster peers (for round-robin operation).
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Unified CM with FQDN cucm.ciscotp.com
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Cisco Expressway-C with FQDN expc.ciscotp.com and Cisco Expressway-E with FQDN
expe.ciscotp.com for TURN server support
expe.ciscotp.com for TURN server support
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Internal video endpoints for video users david.jones and alice.parkes
In this scenario, dialing is typically carried out by users clicking on one of their buddies in the Lync contact list
or by selecting a destination from an electronic address book on the video endpoint.
or by selecting a destination from an electronic address book on the video endpoint.
This guide describes how to connect Lync and a Unified CM via a “Lync gateway” Expressway using a SIP
trunk across an IP network and static routes from Lync to the “Lync gateway” Expressway. The example
presented uses the following setup:
trunk across an IP network and static routes from Lync to the “Lync gateway” Expressway. The example
presented uses the following setup:
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A Unified CM (or cluster of Unified CM peers) – the “Lync gateway” Expressway – to act as the link
between the existing video network and Lync.
between the existing video network and Lync.
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The Lync’s SIP domain is ciscotp.com. The SIP domain for Lync need not be the same as the AD domain
of Lync clients (the Lync login domain used in the login user name may be different from the SIP domain
used in the sign-in address).
of Lync clients (the Lync login domain used in the login user name may be different from the SIP domain
used in the sign-in address).
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The Cisco video network’s domain is vc.ciscotp.com (used for video device registrations).
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Endpoints registered to the video network are provisioned by Unified CM and register with a DN in the
format 3xxx.
format 3xxx.
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Lync clients registered to Lync are identified by URIs, for example:
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David with a URI david.jones@ciscotp.com
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Alice with a URI alice.parkes@ciscotp.com
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Lync Front End Server is configured with a static domain route which routes URIs with the Expressway's
video network domain (vc.ciscotp.com) to the Expressway. Care must be taken when using domain static
routes; any traffic for that domain that Lync cannot handle locally will be routed to Expressway.
video network domain (vc.ciscotp.com) to the Expressway. Care must be taken when using domain static
routes; any traffic for that domain that Lync cannot handle locally will be routed to Expressway.
Clustered “Lync gateway” Expressway
When this document refers to a “Lync gateway” Expressway, a cluster of Expressways can also be used.
The operation is functionally the same, but there is more capacity available.
The operation is functionally the same, but there is more capacity available.
Calls from Lync Server will typically arrive at a single Expressway in the cluster, as Lync Server will use the
static domain routes, which has a single IP address for TCP connectivity and a single FQDN for TLS
connectivity.
static domain routes, which has a single IP address for TCP connectivity and a single FQDN for TLS
connectivity.
If using TLS and round-robin DNS for static route destinations, Lync Server may change the Expressway
peer that it sends calls to, but only at a maximum rate of change of once per 5 seconds. Lync appears to keep
peer that it sends calls to, but only at a maximum rate of change of once per 5 seconds. Lync appears to keep
Microsoft Lync and Cisco Expressway Deployment Guide (X8.2)
Page 6 of 67
Introduction