Numbers not requiring billing codes, Advanced operational features – Aastra Telecom SIP 57I User Manual
Page 469
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Advanced Operational Features
41-001160-00, Release 2.1, Rev 04
6-31
Configuring Advanced Operational Features
Advanced Operational Features
Numbers Not Requiring Billing Codes
Billing codes are not required for the following two types of calls:
•
Emergency calls (E911)
•
Calls between extensions
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