The following table lists all the sub-fields in the H.323 Signaling specific data field.

Table 1: Sub-fields in H.323 Signaling Specific Data Fields

Sub-Field

Description

Sub-Field 1

Protocol Variant (always H323)

Sub-Field 2

H.323 Call Identifier. A 16 byte hexadecimal number that identifies the H.323 call globally and uniquely.

Sub-Field 3

H.323 Conference Identifier. A 16 byte hexadecimal number that is used to associate H.323 calls in the same conference.

Sub-Field 4

H.323 Call Reference Value (CRV). A 2 byte hexadecimal number that identifies the call request of an H.323 call leg. This has no end-to-end or global significance.

The H.323 Protocol string is always 77 characters, including both double quotes.

For example, when the H.323 Call Identifier is:

0x000102030405060708090A0B0C0D0E0F

...and the H.323 Conference Identifier is:

0x00112233445566778899AABBCCDDEEFF

...and the H.323 Call Reference Value (CRV) is:

0x0018

...the Protocol string is:

"H323,000102030405060708090A0B0C0D0E0F,00112233445566778899AABBCCDDEEFF,0018"

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