The ‘Voice Mail Extension’ in the system-parameters features form is the correct parameter. This setting defines the pilot number for the voicemail hunt group, which is essential for directing unanswered calls to the Avaya Aura Messaging system. The other options are either for different purposes or do not exist in the specified forms.

Checking the status of the SIP signaling group and trunk group in SAT is the most efficient first step. This will immediately tell you if the trunks are in-service and if there are any obvious administrative or operational issues (like a down signaling group) that would prevent PSTN calls from being accepted, before delving into more complex diagnostics like dial plans or packet captures.

Directed Call Pickup is the correct feature. It allows a user to pick up a call ringing at a specific extension by dialing a code followed by that extension number. This is different from general Call Pickup (which picks up a call in a user’s own pickup group) and is the appropriate solution for picking up a call at a known, but arbitrary, extension.

The Survivable Remote Server (SRS) function within the Avaya IP Office Server Edition is the key component. When the WAN link to the central Communication Manager is lost, the SRS takes over call processing for the local IP Office users and trunks, allowing the site to remain operational with a defined set of features until the central link is restored.

Ad Hoc Conferencing is the simplest solution for this scenario. It allows the conference initiator (the manager) to establish a conference dynamically during a call by adding participants one by one using the conference feature button or code. This avoids the need to pre-configure a dedicated Meet-Me conference bridge number for this small, informal meeting.

The pattern ‘9[2-9]XX[2-9]XXXXXX’ is a standard North American Numbering Plan (NANP) pattern for long-distance calls. It matches: 9 (access code), [2-9] (area code first digit, not 0 or 1), XX (next two area code digits), [2-9] (central office code first digit), XXXXXX (the 6-digit subscriber number). Option A, 9-1-212-555-1234, fits this pattern perfectly. The other options contain too many digits, an international ‘011’ prefix, or a toll-free ‘800’ code which doesn’t match the [2-9] requirement.

Session Manager is the core registrar and authentication point in the Avaya Aura architecture for SIP endpoints. It authenticates the SIP user credentials, registers the endpoint’s AoR, and manages the routing of SIP signaling between the user and Communication Manager or other applications. Communication Manager handles call processing, but relies on Session Manager for the initial SIP endpoint registration.

The ‘Service Unavailable’ message on an Avaya IP phone typically indicates it cannot communicate with its provisioning server (BFTP – Boot File Transfer Protocol server). Without reaching the BFTP server, the phone cannot download its essential firmware and configuration files, leaving it in a non-functional state. While the other options can cause registration failures, they usually result in different error messages like ‘No Service’ or failure to obtain an IP address.

For EC500 to function, the user’s primary extension on Communication Manager must be linked to their mobile number, which is configured as a Remote Destination. This association allows Communication Manager to treat the mobile phone as an additional appearance of the user’s desk extension, enabling features like simultaneous ring, single-number reach, and call handoff between the desk phone and the mobile.

The ‘Voice Mail Extension’ in the system-parameters features form is the correct parameter. This setting defines the pilot number for the voicemail hunt group, which is essential for directing unanswered calls to the Avaya Aura Messaging system. The other options are either for different purposes or do not exist in the specified forms.0