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http://tools.ietf.org/html/

http://search.ietf.org/internet-drafts/draft-benedyk-sigtran-tali-00.txt This protocol proposes 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). These three methods comprise the service messages.
The following is a description of the TALI payload:

2 bytes
2 bytes
SYNC
OpCode
Length
Sevice message data
TALI Payload structure

SYNC
Four bytes must be (54 41 4C 49) TALI in ASCII.

OpCode
The kind of TALI frame.
The following types of frame exist
 
 
Type of frame Ascii OpCode
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.
 

Vulnerabilities for this protocol (from CVE)

CVE ID Protocol Source Port Targetport

TCP/IP Protocols:

AHARP/RARPATMPBGP-4COPSDCAPDHCPDNS
DVMRPEGPEIGRPESPFANPFingerFTPHSRP
HTTPICMPICMPv6IGMPIGRPIMAP4IPIPDC
IPv6ISAKMPL2FL2TPLDAPMARSMobile IPNARP
NetBIOS/IPNHRPNTPOSPFPIMPOP3PPTPRadius
RIP2RIPng for IPv6RLOGINRSVPRTSPRUDPS-HTTPSCTP
SLPSMTPSNMPSOCKS V5TACACSTALITCPTELNET
TFTPUDPVan JacobsonVRRPWCCPX-WindowXOT