TALI is the interfaces of a Signalling Gateway, which provides interworking between the Switched Circuit Network (SCN) and an IP network. Since the Gateway is the central point of signalling information, not only does it provide transportation of signalling from one network to another, but can also provide additional functions such as protocol translation, security screening, routing information, and seamless access to Intelligent Network (IN) services on both networks.
The Transport Adapter Layer Interface (TALI) protocol provides TCAP, ISUP, and MTP messaging over TCP/IP and is used to support reliable communication between the SS7 Signalling Network and applications residing within the IP network.
This version of TALI provides 3 SS7 signalling transport methods and provides functionality for MTP over TCP/IP (lmtp3), SCCP/TCAP over TCP/IP (sccp), and ISUP over TCP/IP (isot).
Protocol Structure
| 16 bits | 32 bits |
| SYNC | |
| OpCode | |
| Length | Sevice message data |
SYNC - Four bytes must be (54 41 4C 49) TALI in ASCII.
OpCode C Operation code are specified as follows:
- Type of frame
- Test Service on this Socket test
- Allow Service messages on this socket allo
- Prohibit Service messages on this socket proh
- Prohibit Service messages Ack proa
- Monitor Socket message on this socket moni
- Monitor Socket message Ack mona
- SCCP Service message sccp
- ISUP Service message isot
- MTP3 Service message mtp3
- MTP Primitives mtpp
- SCCP Primitives scpp
- Routing Key Registration rkrg
- Routing Key De-Registration rkdr
- Special Service Message spcl
Length - The length of the frame. Non zero if message contains a Service or Monitor Socket message.
Service message data - The service message data.
Related Terms: TCP, TCAP, ISUP, SCCP, IP, MTP, SS7
Sponsor Source: TALI is defined by IETF (http://www.ietf.org) RFC 3094.
Reference: http://www.javvin.com/protocol/rfc3094.pdf: Tekelec"s Transport Adapter Layer Interface