Linksys SPA9000

Linksys Voice System Administration Guide 68
Managing Inbound Calls with the Contact List
Configuring Phone Lines and Calling Routing Behavior
random (ra)—Order is randomized for each call
– interval: The number of seconds to ring each station
– max: The total time in seconds or the total number of cycles to elapse before the call
is rejected or forwarded to the target. If max is less than interval, it is interpreted as
the number of cycles. If max is 0, hunting goes on indefinitely until the caller hangs
up or some one answers the call.
NOTE: You also can create a hunt group that acts as a separate extension within the
system. For more information, see ”Managing Inbound Calls with Hunt Groups,” on
page 73.
Supporting Multiple DID Numbers Per Line Interface
An ITSP can provide a block of DID numbers, for example with a main number of 4085553000,
and additional DID numbers from 4085553001–4084443009. The ITSP can identify the local
client stations to which an external incoming call should be routed. Linksys recommends
including this information in the TO header of the incoming INVITE while the request-URI is
addressed to the line interface user-id. In the INVITE, the ITSP indicates the DID number in the
TO header user-id field.
EXAMPLE SIP Header 1:
INVITE sip:4089993000@itsp1.com SIP/2.0
To: <sip:4089993003@itsp1.com>
Alternatively, the DID number can be indicated as a parameter in the TO header with a
configurable parameter name, such as
didn.
EXAMPLE SIP Header 2:
INVITE sip:4089993000@itsp1.com SIP/2.0
To: <sip:4089993000@itsp1.com>;didn=4089993003
You can identify the field to use for the DID number and the parameter name on the Voice > SIP
page, PBX Parameters section, SIP DIDN and SIP DIDN Param Name fields. For the first example
above, these two fields are ignored; for the second example, SIP DIDN is set to TO Param and
SIP DIDN Param Name is set to didn.
The Contact List is used to route the calls to a client station based on DID numbers that are
embedded in the INVITE message.
EXAMPLE Contact List Rule:
4089993000:aa|4089993001:3001|4089993002:3002|…|4089993009:3009