Sip Cti Services Does Not Come Up; Sip Dialog Not Established - Nortel 1000 Fundamentals

Symptom:
After SIP CTI services are activated, you are unable to log on to the
Signaling Server through Element Manager. When rebooting, some HTTP
tasks are not up.
Possible cause:
Insufficient memory.
Solution:
Check the memory and upgrade the memory to 1 gigabyte (GB), if required.
The Signaling Server (running Converged Office) requires 1 GB of memory.
Release 4.5 only required 512 megabytes (MB).

SIP CTI services does not come up

SIP Dialog not established

Problem:
Phone integration is enabled in Office Communicator and a SIP dialog for
TR/87 was attempted and not established successfully.
Symptom:
When logged into the Office Communicator, the phone icon is not displayed.
Possible cause 1:
The Server URI or the Line URI is incorrect.
Possible cause 2:
Use Microsoft's nslookup tool to verify the DNS configuration on the Signaling
Server and the Host Name resolution for each IP address. For more
information on the nslookup tool, see
or visit the Microsoft Web site at http://support.microsoft.com/kb/200525.
Nortel Converged Office Fundamentals — Microsoft Office Communications Server 2007
Copyright © 2005–2008, Nortel Networks
.
Nortel Communication Server 1000
NN43001-121 01.03 Standard
Release 5.0 30 April 2008
SIP CTI services does not come up 217
Figure 83 "nslookup tool" (page 218),