SIP-I và SIP-T khác nhau như thế nào?

[huutaivn]

Mình có đọc tài liệu về SIP, nhưng mình không hiểu là SIP-I và SIP-T khác nhau ở điểm nào. Vào chúng được dùng trong các trường hợp cụ thể nào? Mong anh em giúp đỡ. Xin cảm ơn.

[camaptrang]

Mình có đọc tài liệu về SIP, nhưng mình không hiểu là SIP-I và SIP-T khác nhau ở điểm nào. Vào chúng được dùng trong các trường hợp cụ thể nào? Mong anh em giúp đỡ. Xin cảm ơn.

Bạn có thể đọc tài liệu này về SIP-I và SIP-T , sự khác nhau và sử dụng trong trường hợp nào ..

2. SIP-T

SIP-T is defined by RFC3372 of the IETFMMUSIC working group. The SIP-T protocol suite contains RFC3372, RFC2976, RFC3204 and RFC3398.

SIP-T is an extension of SIP, which inherits the flexibility of SIP, provides additional support for telephone application and therefore is quite suitable for IP networks. SIP-T enables the SIP messages to carry the ISUP signaling. It established three models for interworking between SIP and ISUP on an end-to-end basis, that is, PSTN-PSTN call over an SIP network, SIP-PSTN call, and PSTN-SIP call.

SIP-T provides two methods for the interworking between SIP and ISUP, that is, encapsulation and mapping, which are defined by RFC3204 and RFC3398 respectively. However, the SIP-T only focuses on the interworking of the basic call, and does not involve supplementary services basically.

3. SIP-I

SIP-I contains TRQ.2815 and Q.1912.5 of the ITU-TSG11 working group. TRQ.2815 defines technical requirements for interworking between SIP and Bearer Independent Call Control Protocol (BICC)/ISUP, including interworking interface model, protocol capability set supported by InterWorking Unit (IWU), and security model of the interworking interface. Q.1912.5 defines the interworking between 3GPPSIP and BICC/ISUP, between SIP and BICC/ISUP and between SIP-I and BICC/ISUP in detail, according to different protocol capability sets supported by IWU at the Network-to Network Interface (NNI) on the SIP side.

SIP-I reuses many IETF standards and drafts, which covers not only the interworking of the basic call, but the interworking of the BICC/ISUP supplementary service.

SIP - T has a wider application. For example, in CDMA2000 protocol, SIP-T is used between MSCes.
SIP - I has been regarded as the core interworking protocol between softswitch and traditional telecommunication networks by 3GPP, main telecommunication carriers and big telecommunication equipment supplier around the world.

[huutaivn]

Cảm ơn camaptrang!