Nortel Networks NN10029-111 User Manual
12
Overview
NN10029-111 Standard MCP 1.1 FP1 (02.02) April 2003
Copyright © 2003, Nortel Networks
Nortel Networks Confidential
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Service package enforcement
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Authentication services
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Converged PC service
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Network/Address Hiding
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911 Notification support
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Instant Messaging
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Presence
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Voicemail server interoperability and MWI (message waiting
indication) notification
indication) notification
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Registration
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Network address book
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Overload control
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Reliability and fault tolerance
Routing and Translation services
Foreign termination
If an incoming request specifies a domain that is not served by (in other
words, is not local to) the SIP Application Module, the SIP Application
Module tries to route that request to the appropriate server for that
domain.
If an incoming request specifies a domain that is not served by (in other
words, is not local to) the SIP Application Module, the SIP Application
Module tries to route that request to the appropriate server for that
domain.
The first step in this process is to query the DNS SRV, if one is
configured in the system, in order to obtain the IP address of the server
associated with the foreign domain.
configured in the system, in order to obtain the IP address of the server
associated with the foreign domain.
Note: A DNS SRV extends the basic functionality provided by a
traditional domain name server (DNS). It allows a protocol field to be
the query for a particular domain and uses that protocol field to
provide the correct IP address of the server for the specified protocol.
For example, clients may query the server with a domain name of
nortelnetworks.com and protocol field of sip. The DNS SRV would
then respond with the IP address of the SIP server for that domain
(which may differ from, for example, the H.323 server). This allows a
domain to have different servers for different protocols.
traditional domain name server (DNS). It allows a protocol field to be
the query for a particular domain and uses that protocol field to
provide the correct IP address of the server for the specified protocol.
For example, clients may query the server with a domain name of
nortelnetworks.com and protocol field of sip. The DNS SRV would
then respond with the IP address of the SIP server for that domain
(which may differ from, for example, the H.323 server). This allows a
domain to have different servers for different protocols.
If this query fails to find the IP address or if a DNS SRV is not
configured, the SIP Application Module attempts to look up the foreign
domain in the database to see if an IP address has been provisioned
for this foreign domain (see the SIP Provisioning Client User Guide for
configured, the SIP Application Module attempts to look up the foreign
domain in the database to see if an IP address has been provisioned
for this foreign domain (see the SIP Provisioning Client User Guide for