AudioCodes Mediant 500L - Reason Header; Numbering Plans and Type of Number

Version 7.2 563 Mediant 500L Gateway & E-SBC
User's Manual 25. Manipulation
25.8.4 Reason Header
The device supports the SIP Reason header according to RFC 3326. The Reason header
describes the disconnection cause of a call:

Sending Reason header: If a call is disconnected from the Tel side (ISDN), the
Reason header contains the value of the received Q.850 cause in the appropriate
message (BYE/CANCEL/final failure response) and sent to the IP side. If the call is
disconnected because of a SIP reason, the Reason header is set to the appropriate
SIP response.

Receiving Reason header: If a call is disconnected from the IP side and the SIP
message includes the Reason header, it is sent to the Tel side according to the
following logic:
• If the Reason header includes a Q.850 cause, it is sent as is.
• If the Reason header includes a SIP response:
♦ If the message is a final response, the response status code is translated to
Q.850 format and passed to ISDN.
♦ If the message isn’t a final response, it is translated to a Q.850 cause.
• When the Reason header is received twice (i.e., SIP Reason and Q.850), the
Q.850 takes precedence over the SIP reason and is sent to the Tel side.
25.9 Numbering Plans and Type of Number
The IP-to-Tel destination or source number manipulation tables allow you to classify
numbers by their Numbering Plan Indication (NPI) and Type of Number (TON). The device
supports all NPI/TON classifications used in the ETSI ISDN variant, as shown in the table
below:
Table 25-13: NPI/TON Values for ETSI ISDN Variant
NPI TON Description
Unknown [0] Unknown [0] A valid classification, but one that has no information
about the numbering plan.
E.164 Public
[1]
Unknown [0] A public number in E.164 format, but no information
on what kind of E.164 number.
International-Level2 Regional
[1]
A public number in complete international E.164
format, e.g., 16135551234.
National-Level1 Regional [2] A public number in complete national E.164 format,
e.g., 6135551234.
Network-PSTN Specific [3] The type of number "network specific number" is
used to indicate administration / service number
specific to the serving network, e.g., used to access
an operator.
Subscriber-Level0 Regional
[4]
A public number in complete E.164 format
representing a local subscriber, e.g., 5551234.
Abbreviated [6] The support of this code is network dependent. The
number provided in this information element presents
a shorthand representation of the complete number
in the specified numbering plan as supported by the
network.