, the optional subfield parameter specifies which part of the address is to be considered. The following table gives the definition of subfields for each alias type.

If a subfield is not specified for the alias type being matched then the

not-present action will be taken.

address-type Either h323 or sip, based on the type of endpoint that originated the call.
user

For URI aliases this selects the username part. For H.323 IDs it is the entire ID and for E.164 numbers it is the entire number.

host

For URI aliases this selects the domain name part. If the alias is an IP address then this subfield is the complete address in dotted decimal form.

tel

For E.164 numbers this selects the entire string of digits.

alias-type

Gives a string representation of the type of alias. The type is inferred from the format of the alias. Possible types are:

•

Address Type

•

Result

•

URI

•

url-ID

•

H.323 ID

•

h323-ID

•

Dialed Digits

•

dialedDigits

address-switch

The otherwise node will be executed if the address specified in the address-switch was found but
none of the preceding address nodes matched.

The not-present node is executed when the address specified in the address-switch was not
present in the call setup message. This form is most useful when authentication is being used.
With authentication enabled the VCS will only use authenticated aliases when running policy so
the not-present action can be used to take appropriate action when a call is received from an
unauthenticated user (see the example

Call screening of authenticated users

otherwise

not-present