Attendant

If a call made directly to or redirected to the attendant group is routed to an attendant through IGAR, that attendant will not be alerted until the trunk is active.

Alternate Facility Restriction Levels

If a user has administered the alternate FRL, IGAR uses this FRL instead of the default FRL for selecting a trunk.

Call Redirection

IGAR routes the call to the destination by using the alternate route specified regardless of the redirection feature active on the extension. After the call reaches the destination using IGAR, normal call redirection occurs.

Meet-Me Conferencing

If the first Meet-Me vector step is not an announcement, but IGAR is triggered for the call, the caller hears silence for a few seconds until the Trunk IGC is active.

Station Locking

Communication Manager routes the outgoing trunk IGC by using the COR of the station that made the initial call. Therefore, a locked station whose Station Lock COR blocks the outgoing trunk calls cannot use IGAR. The station can use IGAR only when the station is unlocked.

Announcement

When IGAR is required to connect a nonrepeating announcement to a party, Communication Manager waits until the trunk IGC is active before playing the announcement.

Auto answer

When IGAR is required on a call to a party with Auto answer enabled, Communication Manager waits until the trunk IGC is active before initiating the autoanswer.

Hunt Group

If a call made to a hunt group is routed to an agent through IGAR, the agent is not alerted until the trunk IGC is active.

Malicious Call Trace (MCT)

If an agent or any station activates MCT for a call that is routed through a trunk IGC, the trunk does not appear in the MCT display or history.

However, if an incoming malicious call is connected to the called party through a trunk IGC, the system displays the incoming trunk in the MCT display and history.

Automatic Wakeup

If an announcement is administered for automatic wakeup calls, IGAR might be used to connect the announcement to the hotel guest telephone.

Call Detail Recording (CDR)

CDR records are created for IGAR calls.

Emergency Calls (E911)

If a station dials an emergency number, and the only available outgoing trunk is in a Network Region accessible only by IGAR, the calling party information is sent over the outgoing trunk while the IGAR connection is set up. Thus, even if the IGAR connection fails, emergency responders are notified of the emergency call.

Personal Central Office Line (PCOL)

If the PCOL button on a voice terminal is associated with a trunk in a different Network Region, IGAR might be required to set up the connection. The user hears the local dial tone, and any digits dialed are buffered and sent when the IGAR trunk becomes active.

Automatic Alternate Routing (AAR)

Although Communication Manager selects a trunk for IGAR by using ARS, the users can use ARS Digit Conversion to convert the number to a private-network number and use AAR instead.

Tenant Partitioning

Tenant Partitioning can block a tenant from calling another tenant and from using trunks allocated to another tenant. If IGAR is triggered on a call between tenants, IGAR can use trunks assigned to either tenant to set up the Trunk IGC.

Trunk-to-Trunk Transfer

The Trunk-to-Trunk Transfer system parameter does not control whether a call that includes a Trunk IGC can be transferred.

Trunk Access Code (TAC) Dialing

When a user dials the TAC of a trunk group in a different Network Region, IGAR might be required to set up the connection. In most cases, the user hears the local dial tone, and any digits dialed are buffered and sent when the IGAR trunk becomes active.

Stub and Core Network Region

If a stub NR numbered in the range 1-250 has a media gateway or port network, IGAR can be used directly to and from one of these stub NRs.

The NRs from 251-2000 are all stub NRs and cannot have a media gateway or port network. IGAR might be part of the end-to-end media path for endpoints in the stub NR if the associated core NR has a media gateway or port network. However, IGAR cannot be used from the stub NR (251-2000) to the core NR.

Group Paging

If an endpoint in the paging group requires IGAR for the connection, the endpoint might not hear the first few seconds of the page.

Transfer

When a call using an IGAR trunk is transferred and the transferred call no longer needs the IGAR trunk, the IGAR trunk is dropped after the new nontrunk connection is ready.

Call Pickup

if IGAR is triggered and a user picks up the call quickly, the user hears silence for a few seconds until the Trunk IGC is active.

Trunk Answer Any Station (TAAS)

If IGAR is triggered because the incoming trunk is in another Network Region from the TAAS External Alert port, and a user enables TAAS quickly, the user hears silence for a few seconds until the Trunk IGC is active.

Bridging

When a user with a bridged call appearance button presses that button and a Trunk IGC is needed to connect the user to the call, the user notices a delay before hearing the ongoing conversation.

Call Coverage Redirected Off-Net (CCRON)

CCRON involves outgoing trunk calls. Therefore, CCRON works even if there is a delay in the voice path between the calling station and the trunk to the remote coverage party.

Coverage Answer Group

If IGAR is triggered on a call that is redirected to a Coverage Answer Group, a single Trunk IGC is created between the calling party and every Network Region of the group.

Call Waiting

The Call Waiting tone for an incoming call is not played to an analog user on the existing call until the trunk requested by IGAR is active.

Terminating Extension Group

If IGAR is triggered on a call that is redirected to a Terminating Extension Group, a single Trunk IGC is created between the calling party and every Network Region of the group.

Display Charge Advice or PPM

The charging information or PPM received from the PSTN for a trunk used by IGAR is not displayed. However, the information is recorded in CDR.

Initial IP-IP Direct Media

For an incoming call from a trunk that has Initial IP-IP Direct Media enabled and if the call routes to another SIP trunk, the IGAR is set up only after the call is answered by the terminating party. Due to this setting, there might be a delay of about 5-10 seconds for talkpath setup.

Multi-Level Precedence and Preemption (MLPP)

In a Defense Switched Network (DSN), IGAR treats an MLPP call in the same manner as any other call.

Video calls

If a new video call has insufficient video bandwidth but has sufficient bandwidth for an audio call, the call continues without the video component. However, if the bandwidth is insufficient for both video and audio, the call can trigger IGAR and get a trunk IGC. The trunk IGC is used only for the audio media.

Multi-Device Access (MDA)

If a user has registered several SIP endpoints by using MDA, and not all endpoints are in the same NR, the NR of the endpoint that the user uses to make and receive calls determines whether Communication Manager creates a trunk IGC for a call.

Dual Registration

If a user has registered both an H.323 and a SIP endpoint by using Dual Registration, Communication Manager stores the NR of:

• The H.323 endpoint only once when the endpoint registers.

• The SIP endpoint every time the SIP endpoint makes or receives a call.

If the user becomes active at the H.323 endpoint after making calls through the SIP endpoint, Communication Manager triggers IGAR and sets up the trunk IGC to the SIP location.