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Configuring Voice Services
SIP Trunking and Hunt Groups on the SPA8000
ATA Administration Guide 81
4
STEP 5 If the call is picked up by the PBX, the Line UA replies 200 OK with SDP to the
internal Proxy. The Trunk UA in turn replies 200 OK to the ITSP and relay the Line
SDP in the 200 OK message also. If all goes well, the Line UA and the ITSP
equipment start exchanging RTP packets afterwards.
Contact List for a Trunk Group
The hunting process for incoming calls is controlled by the Contact List. The
Contact List specifies the lines to ring, the order in which to ring them, the duration
to ring one line before trying another line, and the maximum period to hunt. Below,
the syntax is described and examples are provided to help you to configure the
Contact List for each trunk group.
SYNTAX: line[,line[,line[…]]],hunt=hrule[,cfwd=target]
• line: The line numbers (1 - 8), or a wildcard * or ? to represent all lines.
• The Trunk UA rings only trunk lines, that is, lines that are assigned to a trunk
group through the Voice tab > Line page, Trunk Group field. The Trunk UA
does not ring any standalone lines that are included in the Contact List. The
Trunk UA rings any trunk line that is included in the list, even if it is not
assigned to the particular trunk group for this Contact List.
• You can instruct the SPA8000 to hunt only the phones that are on-hook,
through the Voice tab > SIP page, Trunking Parameters section, Hunt
Policy field. See “Setting the Hunt Policy,” on page 86.
• hunt=hrule: The hunt order, ring interval, and maximum duration, in the
following format: hunt=algo;interval;max
• algo: The hunt order.
- re: Restart. Hunting starts at the beginning of the list. If the first line does
not answer within the specified interval (see below), the hunt
proceeds through the lines in sequential order.
- ne: Next. The Trunk UA determines the line that was chosen in the
previous hunt, and hunting starts with the next line in the list. If that line
does not answer within the specified interval (see below), the hunt
proceeds through the lines in sequential order.
- ra: Random order. The Trunk UA randomly chooses a line from the list. If
the selected line does not answer within the specified interval (see