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150 Appendix B Understanding Telephony Routing and Translations
NN10043-113
[Standard - Nortel Networks Confidential]
The following figure shows an example of the subdomain concept (Figure 94).
Figure 94 Example domain tree
Class of Service
Class of Service (COS) screens and restricts users from accessing certain
telephony routes within a domain and subdomain. The following restrictions are
imposed on the use of COS:
Tip: Subscribers do not have to be aware of subdomains. Subdomains
are used only to group subscribers for partitioning telephony
translations.