Allied Telesis AT-iMG634 - R2 User's Guide download pdf (Page 587)

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VoIP SIP Servers, Users & the Forwarding Database VoIP SIP

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iMG/RG Software Reference Manual (Voice Service)

If no match is found in the forwarding database, the INVITE message is routed to the first available proxy server

(starting with the Master proxy server if defined) using the calling user domain as called endpoint domain.

6.2.2.3.2 Incoming calls

If a match is found, a MOVED TEMPORARY SIP message is sent back to the call originator reporting the contact

address defined by the CONTACT field in the matched FDB entry.

If the FDB entry defines the FWADDRESS field, the called number is changed from the dialed number to the

number defined in the FDB entry FWADDRESS field.

If no match is found in the forwarding database, the call is rejected.

6.2.2.3.3 Address and digit-map

The address field specified in FDB entries can be defined using digit map expressions.

Digit map expressions are used to increase system flexibility when defining forwarding rules that must mach

multiple addresses (digit maps are used also in the VoIP access port module).

A digit map is defined either by a case insensitive ‘string’, or by a list of strings. Each string in the list is an alter-

native numbering scheme, specified either as a set of digits or as an expression to which the called address is

compared by the signalling end-point layer to find the shortest possible match. The following constructs can be

used in each digit map:

• Digit

A digit from '0' to '9'

• Wildcard

The symbol ‘x’ that matches any digit (‘0’ to ‘9’).

• Range

One or more digit symbols enclosed between square brackets (‘[‘ and ‘]’).

• Subrange

Two digits separated by hyphen (‘-’) that matches any digit between and including the two. The subrange

construct can only be used inside a range construct, i.e. between ‘[‘ and ‘]’.

• Position

A period (‘.’) that matches an arbitrary number, including zero, of occurrences of the preceding construct.

Digit map expressions are typically used when managing locally originated calls.

Using digit map expressions in this situation, it is possible to define a generic rule in such a way that all calls are

routed to a specific contact (e.g. the proxy server) which will then perform call routing.

Digit map expressions are also useful for designing small networks without need to make use of any location

servers, proxy servers or gatekeepers.

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