Dialogic 4000 SERIES Instrukcja Użytkownika Pobierz pdf (Strona 68)

Dialogic

4000 Media Gateway Series Reference Guide

Page 68

Every route defines only one direction. Therefore, at least two routes are needed to support both PSTN-to-SIP

and SIP to PSTN connections. The basic call (without address manipulation) is processed as follows:

Information about Call Processing

• Each route can point to several destinations, between which Diva SIPcontrol chooses according to the following

settings (in decreasing order of importance):

• Availability (destination enabled)

• Alive state of destination (if enabled to be verified)

• Priority (Master/Slave)

• Channel load quota (a factor calculated by comparing used vs. total supported channels)

• For each call, only one route is chosen. Even if another route also matches the call criteria, only the first

matching route is ever evaluated. Therefore, default routes should be created carefully and located at the

end of the routing table, if appropriate.

• Load balancing/failover is only performed between the destinations of a single route.

• Routes without any conditions always match (as long as the source endpoint is listed in route sources).

1. Find and assign an endpoint for an incoming call

request (PSTN: lookup by CAPI controller

number; SIP: lookup by "From" address of

received message).

2. Go sequentially through the list of routes and

find the first route that has this endpoint

defined in its configured sources list.

3. Determine whether at least one call address

condition of this route matches simultaneously

the called, calling, and redirected addresses of

the call request; if not, find another route.

4. If any route condition matches, verify in the list

of configured destinations which one is the

most preferred. This is done based on settings.

See Information a

bout Call Processing below for

more information.

5. Try to establish the call via this destination. If

the destination is unavailable or rejects the call,

try the next destination of the route. Note that

the call will be aborted immediately if a cause

code is received that signals final failure, e.g.,

user busy or unallocated number.

6. The call is established.

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Dialogic 4000 SERIES Instrukcja Użytkownika Strona 68