Significance
Significance
- In July 2002, 3GPP adopted SIP for their signaling protocol (Release5)
- 3GPP adopts SIMPLE as instant messaging/presence mechanism (Release6)
However, there are some differences between the 3GPP and IETF points of view
|
3GPP |
IETF |
|
Network does not trust the user |
User only partially trusts the network |
|
layer 1 and layer 2 specific |
generic |
|
walled garden |
open access |
Not surprisingly the 3GPP system (called “IMS”) for using SIP is rather complex with a number of new components: Proxy Call Session Control Function (P-CSFC), Interrogating Call Session Control Function (I-CSFC), Serving Call Session Control Function (S-CSFC), Home Subscriber Server (HSS), Application Server (AS), Subscription Locator Function (SLF), Breakout Gateway Control Function (BGCF), Media Gateway Control Function (MGCF), and Media Gateway (MGW)
Transcript
[slide181] What's the significance? Well, 3GPP in 2002 adopted SIP. Unfortunately, 3GPP being a traditional telecom oriented thing, the network doesn't trust the user. Users are very suspect. In IETF, the users only partially trust the network. 3GPP is very layer one and layer two specific. IETF said, ooh, what media? 3GPP, is set up as a walled guarded IETF model was open access. So if you take all those things that we just described for SIP and you take to the 3GPP world, you get all of these different components. The net result is 3GPP calls it, not SIP, but IMS, the IP media system. And they do all kinds of things like encrypting all of the traffic from the terminal even into the gateway of the operator, even though it's going over the operator's network.
Anyhow, you can read more about it.