PROTOCOL

The PROTOCOL identifier tag, the standard character format for a SIP URI is UTF-8.

Size

Maximum length of number tag is 256.

Values

SIP
Q.931 (isdn)
SS7

Valid Attributes

PROTOCOL.VARIANT

SIP

RFC3261

ISDN variants

EUROISDN
5ESS_5E8
5ESS_5E9
DMS_BCS34
TR41449
T1_NATIONAL
DMS_NATIONAL
DMS_250
INS_1500
QSIG
UNKNOWN

SS7

ANSI/T1 GENERIC (2000)
ITU/E1 GENERIC (WhiteBook)

PROTOCOL.NUM

SIP: 36
ISDN: 24
SS7: 33

Valid Usage

In an inbound SIP invite message in SV542
Answer confirm in SV542.
In SV543 on a far-end hang-up in SV543.