For a user with a primary desk phone (like an H.323 J179) who also uses IX Workplace on a mobile device, the ‘Dual Mode’ device type with ‘Mobility’ enabled is essential. This configuration allows the same extension to be active on both devices simultaneously, enabling features like call handoff and shared line appearance, which is the core of a seamless user experience.

The built-in ‘Packet Capture’ tool in System Manager is the most direct and efficient method for an Avaya engineer to capture SIP packets on a specific interface. It allows for precise filtering (e.g., by IP address and port) to isolate traffic for the problematic trunk, providing the raw SIP messages needed to diagnose signaling issues without requiring external tools or SBC access.

Silence Suppression (or Voice Activity Detection – VAD) can cause significant issues in conference calls, especially with varying network conditions and client types. When enabled, it mutes audio streams during periods of silence. If not implemented perfectly across all legs, it can lead to audio clipping, distortion, or the perception of one-way audio as packets are dropped. Disabling it often resolves such audio quality issues in multi-party calls.

Local Survivability (LSV) is the critical SBCE function for branch office resilience. In a WAN failure, the SBCE with LSV takes over call processing for registered endpoints (phones, trunks) within the branch. It uses a locally cached copy of necessary configuration to allow calls within the branch and to/from the PSTN (via local trunks) to continue, maintaining business operations.

The ‘Protocol Variant’ field in the ‘Signaling Group’ form is the central point for defining the specific dialect of Q.SIG, PRI (NI2, ETSI, etc.), or other protocol used on a trunk. This setting controls how signaling messages (like setup, information, release) are formatted and interpreted, directly impacting the handling of features like caller ID (CLIP/CLIR). Matching the carrier’s specified variant here is essential for proper interworking.

A Multi-Line Hunt Group (MLHG) configured with the ‘All Member’ distribution algorithm (often called ‘Broadcast’ or ‘Simultaneous’) will ring all specified members at once. This satisfies the requirement for simultaneous ringing. The call will then follow the hunt group’s busy/no-answer treatment, which can be set to send to a shared voicemail pilot, avoiding a sequential hunt.

The ‘Location’ parameter in IP Network Regions is used to define the perceived network “distance” between regions (e.g., Local, Private Network, Public Network). This setting directly influences the codec negotiation. If the location is set too restrictively (e.g., one region is ‘Public’ and the other ‘Local’), it may force the use of a low-bitrate codec like G.729, even on a high-bandwidth LAN, potentially causing poor audio quality. The issue described is a classic symptom of a misconfigured Location setting forcing transcoding or an inefficient codec.

With modern Avaya Aura releases, the primary administrative interface has shifted from the legacy SAT (System Access Terminal) to the web-based System Manager. Many advanced and newer configuration parameters are only accessible or editable via System Manager. SAT remains for some legacy tasks, but grayed-out fields typically indicate that the specific parameter is now managed through the newer, more secure web interface.

Security for a SIP trunk is established by linking a ‘SIP Entity’ (which defines the remote peer, including its IP address/FQDN and transport protocol) to a ‘SIP Signaling Group’. The ‘Peer Server’ field in the Signaling Group points to the SIP Entity. By defining the carrier’s SBC IP in the SIP Entity and linking it correctly, the system knows to only accept signaling from that trusted source. This is the fundamental pairing for SIP trunk security.

For a user with a primary desk phone (like an H.323 J179) who also uses IX Workplace on a mobile device, the ‘Dual Mode’ device type with ‘Mobility’ enabled is essential. This configuration allows the same extension to be active on both devices simultaneously, enabling features like call handoff and shared line appearance, which is the core of a seamless user experience.0