ADTRAN AOS Version R10.1.0 Command Reference Manual page 3581

Command Reference Guide Voice SIP Trunk Command Set
Functional Notes
During ISDN call establishment on a PRI, each phone number in the SETUP message is qualified with a
pair of identifiers, TON and NPI, which determine how the phone number is to be treated. The mechanism
by which a SIP server communicates information about phone numbers is the SIP URI phone-context field.
The phone-context command allows a table to be configured that stores associations between the SIP
URI phone-context strings and NPI/TON value pairs. This map allows the SIP trunk to convert between
numerical NPI/TON value pairs and a phone-context text string. Consequently, phone number information
is preserved during interworking between SIP and ISDN PRI.
In the PRI to SIP direction, the received NPI/TON values are passed through the switchboard to the SIP
trunk. The SIP trunk then uses the phone-context table to find the corresponding phone-context text string,
and the string is inserted as a phone-context= parameter into the outgoing SIP URI.
In the SIP to PRI direction, the SIP trunk uses the phone-context table to convert the string received in the
phone-context= parameter to the corresponding NPI/TON values. The values are then passed through
the switchboard to the PRI trunk and on to the connected equipment.
Usage Examples
The following example creates an entry in the phone-context map that associates the phone-context string
phonesystem.adtran.com with the private NPI and level0 TON:
(config)#voice trunk t01 type sip
(config-t01)#phone-context phonesystem.adtran.com plan private type level0
60000CRG0-35E Copyright © 2012 ADTRAN, Inc. 3581