Lync 2010 : Using same FQDN and IP address for SIP access Edge, Web Conferencing Edge, A/V Edge

Hi Friends,
Please assist on below query.
Will it possible to use the same FQDN in Lync Edge? Since it has different Port numbers for each service, one public IP  for all FQDN for access will save me purchasing multiple Certificates for SANs
FQDN
IP Address
Port
Map to
Sip.domain.com
12.34.34.34
5061 (TLS)
 SIP Access Edge
Sip.domain.com
12.34.34.34
444(TLS
Web Conferencing Edge
Sip.domain.com
12.34.34.34
443(TCP
A/V Edge
I have a wildcard SSL purchased already and for this purpose I need to purchase more certificates per SAN if unique FQDN required.
Thank You.

Yes, although a wildcard entry only will not work entirely for all Lync clients and versions.
I would suggest something like this:
Edge External
CN: sip.domain.com
SAN: sip.domain.com, webconf.domain.com
Reverse Proxy Listener(s)
CN: lyncwebexternal.domain.com
SAN: lyncwebexternal.domain.com, *.domain.com
The wilcard entrty can replace the SimpleURLs (meet, dialin) but some clients (like any Lync Phone Edition devices prior to the June 2012 firmware) do not support wildcard entries so providing the external web services FQDN is required.  also never
put the wildcard etry in the Common Name as devices/client that do not support wildcard entries may be tripped up there and then never even look at the SAN field.
A cheaper alternative (although not typically recommended, this does work) would be to use a single certificate for both servers, like this:
Edge/RP Combo Cert
CN: sip.domain.com
SAN: sip.domain.com, webconf.domain.com, lyncwebexternal.domain.com, *.domain.com
Jeff Schertz | Microsoft Solutions Architect - Polycom | Lync MVP

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