Question 1
Q1A support engineer is analyzing a SIP trunk issue where calls are failing to establish. The System Status Application (SSA) shows the trunk is in service, but outgoing calls receive a '403 Forbidden' response. The provider requires the 'Diversion' header to be present for forwarded calls to authenticate correctly.
Which specific setting in the SIP Line >> SIP Advanced tab must be configured to ensure the original calling party's number is preserved and presented correctly in the SIP headers without violating the provider's authentication rules?
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Correct answer: B
To support forwarded calls where the provider authenticates based on the trunk number but needs the original caller ID for display or billing, the Diversion header is used. This allows the 'From' header to match the authenticated trunk pilot number (preventing 403 Forbidden) while the 'Diversion' header carries the original caller's information.