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Appendix B Understanding Telephony Routing and Translations 151
SIP Provisioning Client User Guide
[Standard - Nortel Networks Confidential]
• A single COS value can be assigned to a list of routes, domain, subdomain or
a subscriber.
• A domain, subdomain or subscriber has access to the routes if the COS value
equal or higher is assigned to a list of routes.
• The domain based COS value is used to determine the telephony routes for
incoming sessions from gateways or other SIP networks. In this scenario the
domain will not host the originator of the call so the domain’s routing
behavior is applied.
•IftheFrom: header and Request URI: do not have the same domain, then the
domainspecifiedintheRequest URI: is used to determine the telephony
routes.
•IftheFrom:, To:,andRequest URI: domains are the same, then the
subscriber’s COS and the domain assigned to the subscriber is used to
determine the telephony routes. If the user does not have any COS value then
the domain’s COS value in which the user actually exists is applied.
• The same COS values can be assigned to a domain, subdomain and a
subscriber. This allows or restricts a subscriber in the subdomain to access
routes in the parent and other subdomains.
SIP Application Module routing stages
The following figure (Figure 95) 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 parent and subsequent
subdomains are checked for routes with the same, or higher, COS value.
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