Linksys ATA Administration Guide
138
Trunk Group page (SPA8000)
Voice tab > Trunk Group page
Subscriber Information section
Field
Description
Display Name
Display name for caller ID.
User ID
Extension number for this line.
Password
Password for this line.
Use Auth ID
To use the authentication ID and password for SIP authentication, select yes.
Otherwise, select no to use the user ID and password.
The default is
no
.
Auth ID
Authentication ID for SIP authentication.
Call Capacity
Maximum number of calls allowed on this trunk group. Choices: 1-15 or
unlimited (16 calls). Default is
unlimited
.
Both incoming call and outgoing call are counted towards this limit. The call
capacity has the following impact on call handling:
•
Inbound calls: When the limit is reached, the Trunk SUA replies 486 to the
caller.
•
Outbound calls: When the limit is reached, the Line SUA plays a fast busy
tone to the caller. Note that a trunk line can make an outgoing call only
through its own trunk. If that trunk reaches full capacity, it will not
attempt to failover to use other trunks
Contact List
This parameter determines which trunk lines to ring on an incoming call.
When an incoming call is detected by the Trunk SUA (SIP User Agent), the
SUA first checks if there is capacity to handle the call. If not, the SUA rejects
the call with a 486 response. If there is spare capacity, the SUA consults the
Contact List to determine which lines to ring (that is, for the proxy to send SIP
INVITE to), and starts "hunting."
The Contact List specifies the lines, the hunt method, and other options.
EXAMPLES:
•
1,2,3,4,5,6,7,8,hunt=re;*;1
Lines 1 through 8 are participating (
1,2,3,4,5,6,7,8
). The Trunk SUA will
hunt to each specified line in the specified order (
hunt=re
). The call stays
with a selected line until the call is either answered, rejected, or
cancelled by the caller (
*
). The Trunk SUA replies 486 right away if no line
is available to ring at the moment (
1
).
•
?,hunt=al;30;0,cfwd=14089993326
A wildcard character is used to represent “all trunk lines.” All lines ring
simultaneously (
hunt=al
). If there is no answer after 30 seconds (
30
), the
call is forwarded to the specified number (
cfwd=14089993326)
.
•
?,hunt=ra;12;1,cfwd=14089993326
A wildcard character is used to represent “all trunk lines.” The Trunk SUA
hunts in random order (
hunt=ra
). If there is no answer within 12 seconds
(
12
), the Trunk SUA chooses another line at random. If there is no answer
after 1 round (
1
), the call is forwarded to forwarded to the specified
number (
cfwd=14089993326
).
