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SIP Provisioning Client User Guide
[Standard - Nortel Networks Confidential]
Appendix B
Understanding Telephony Routing and
Translations
This section provides a basic understanding of how to provision telephony style
translations interworking with traditional circuit-switched network routing.
Topics in this section:
• “Telephony routing concepts” on page 149
• “Telephony routing terminology” on page 152
• “Sample dial plan for telephony routes” on page 155
• “Telephony route provisioning scenario and examples” on page 158
Telephony routing concepts
The basic function of any communication equipment is routing, and SIP-based
systems add additional requirements to routing when compared to traditional
circuit-switched network-based routing. Routing in the VoIP networks adds the
complexity of integrating with the traditional circuit-switched networks and
domain-based VoIP/SIP networks.
Subdomains
The concept of subdomains allows the domain administrator to group users into a
smaller routing groups. For example, Nortel Networks can have a single system
supporting a Richardson domain and an Ottawa domain. Users within Nortel
Networks are assigned to subdomains, but can be reached by just using the top
domain. The concept of SIP subdomains is similar to the email domains used
within an enterprise.