| Ingress/Egress Field Information | Field | REGISTER | SUBSCRIBE / REFER /
NOTIFY | MESSAGE / PUBLISH /
OPTIONS | Field Length |
|---|
SIP Request URI Header | 1 | X | X | X | 256 |
Call ID | 2 | X | X | X | 256 |
From Header | 3 | X | X | X | 256 |
To Header | 4 | X | X | X | 256 |
Expires | 5 | X | X | | 10 |
Contact Address in Request | 6 | X | X | X | 128 |
Contact Address in Response
(Along with Feature Tag in Contact Header) | 7 | X | X | X | 128 |
Accept-Contact Header | 8 | X | X | X | 200 |
Proxy-Authorization/WWW-Authenticate header | 9 | X | X | X | 128 |
NAPT Status of the SIP SG for Signaling | 10 | X | X | X | 1 |
Inbound SMM Indicator | 11 | X | X | X | 1 |
Outbound SMM Indicator | 12 | X | X | X | 1 |
IP Address for FQDN calls | 13 | X | X | X | 48 |
Transport Protocol | 14 | X | X | X | 1 |
ICID | 15 | X | X | X | 12764
|
Generated Host | 16 | X | X | X | 12764
|
Originating IOI | 17 | X | X | X | 12764
|
Terminating IOI | 18 | X | X | X | 12764
|
Asserted-Identity Header | 19 | | X | X | 256 |
P-Visited-Network-Id | 20 | X | | | 256 |
P-Called-Party-Id | 21 | | X | X | 128 |
P-Charging-Function-Address | 22 | X | X | X | 1024 |
| Transit IOI List | 23 | X | X | X | 320639 |
| Feature-Caps header | 24 | X | | | 300 |
| P-Access-network-Info | 25 | X | X | X | 256 |
| User-Agent | 26 | X | X | X | 50 |