Nortel Networks NN10029-111 User Manual
14
Overview
NN10029-111 Standard MCP 1.1 FP1 (02.02) April 2003
Copyright © 2003, Nortel Networks
Nortel Networks Confidential
These routes include routes for private digit dial plans, routes to
gateways, and telephony-style routing between SIP domains.
Multiple lists can reuse the same routes in a route list.
gateways, and telephony-style routing between SIP domains.
Multiple lists can reuse the same routes in a route list.
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assign class of service (COS)
COS is basically used to block particular types of calls, such as
international dialing or long-distance dialing. For example,
telephones in an office lobby can be restricted to local and
emergency calls only in a domain.
international dialing or long-distance dialing. For example,
telephones in an office lobby can be restricted to local and
emergency calls only in a domain.
Figure 5, “Relationship between Telephony routing stages,” shows the
relationship between the telephony routing stages provided by the SIP
Application Module. If the COS value of the subscriber and subdomain
route do not match, then the SIP Application Module checks the parent
for routes with the same or higher COS value.
relationship between the telephony routing stages provided by the SIP
Application Module. If the COS value of the subscriber and subdomain
route do not match, then the SIP Application Module checks the parent
for routes with the same or higher COS value.
Figure 5 Relationship between Telephony routing stages
Route lists
The Telephony routing service is an enhancement to the
Location Server on the SIP Application Module. This enhanced
Location Server function has the ability to translate PSTN numbers into
Location Server function has the ability to translate PSTN numbers into
Foreign domain routing
Do database lookup
Do database lookup
Failed
DNS A
record*
record*
No subscriber
*If the DNS A record fails, a 404 Error response is sent back to the originator.