The next step in deployment is to prepare the Office Communications Server 2007 R2 Domain Name System (DNS) entries. The following tables show the internal and external DNS records that you need. If you are performing this walkthrough to set up Office Communications Server 2007 R2 for your company, substitute your own domain name for Litwareinc.com.

Note:
The DNS names that are suggested here are examples. The DNS record must match the fully qualified domain name (FQDN) for the external interface(s) and that the certificate subject name or subject alternate name (SAN) match the FQDN. The client receives the proper DNS information for Audio/Video and Web Conferencing from in-band provisioning after contacting and authenticating to sip.litwareinc.com. For details, see DNS Requirements for External User Accessin the Planning and Architecture documentation.

Table 1. Internal DNS Records

Internal DNS record Usage Record type Port IP address

_sipinternaltls._tcp.litwareinc.com

Client auto-connect

SRV Record

Resolved host: ocsse1.litwareinc.com

5061

n/a

ucupdates-r2.litwareinc.com

Device Update Service

A Record that points to the web components server (ocsse1.litwareinc.com)

n/a

192.168.1.100

ocsse1.litwareinc.com

Name-based service resolution

A Record

Ocsse1.litewareinc.com

n/a

192.168.1.100

ocsedge.litareinc.com

Name-based service resolution

A Record Ocsedge.litwareinc.com

n/a

172.16.1.100

cwa.litwareinc.com

Name-based service resolution

A Record Cwa.litwareinc.com

n/a

192.168.1.101

as.cwa.litwareinc.com

CWA desktop sharing

CNAME that resolves to cwa.litwareinc.com

n/a

n/a

download.cwa.litwareinc.com

CWA desktop sharing

CNAME that resolves to cwa.litwareinc.com

n/a

n/a

For details, see DNS Requirements for Automatic Client Sign-Inand DNS Requirements for Standard Edition Serversin the Planning and Architecture documentation.

Table 2. External DNS Records

External DNS record Usage Record type Port IP address

sip.litwareinc.com

Primary SIP record for sip domain

A Record

n/a

192.0.2.100

av.litwareinc.com

Audio/video conferencing

A Record

n/a

192.0.2.101

lm.litwareinc.com

Web conferencing

A Record

n/a

192.0.2.102

ocs.litwareinc.com

Web components

Web Farm FQDN

A Record

n/a

192.0.2.105

cwa.litwareinc.com

CWA access

A Record

n/a

192.0.2.103

as.cwa.litewareinc.com

CWA desktop sharing access

CNAME to cwa.litwareinc.com

n/a

n/a

download.cwa.litewareinc.com

CWA desktop sharing access

CNAME to cwa.litwareinc.com

n/a

n/a

_sip._tls.litwareinc.com

External user access

SRV to sip.litwareinc.com

443

n/a

_sipfederationtls._tcp.litwareinc.com

Federation discovery

SRV to sip.litwareinc.com

5061

n/a

See Also