CISCO-ITP-XUA-MIB

The MIB for MTP3 User Adaptation (M3UA) and SCCP User Adaptation (SUA) for Cisco's IP Transfer Point (ITP) implementation. The Cisco IP Transfer Point (ITP) is a hardware and software solution that transports SS7 traffic using IP. Each ITP node provides function similar to SS7 signaling point. The relevant ITU documents describing this technology is the ITU Q series, including ITU Q.700: Introduction to CCITT Signaling System No. 7 and ITU Q.701 Functional description of the message transfer part (MTP) of Signaling System No. 7. The relevent information about M3UA and SUA is available at the IETF: http://www.ietf.org/html.charters/sigtran-charter.html This MIB consists of the following tables: M3UA/SUA (XUA) Instance Table M3UA/SUA (XUA) Instance Local IP Table Signaling Gateway Mate Table Signaling Gateway Mate Remote IP Table Application Server Process (ASP) Table Application Server Process (ASP) Remote IP Table Application Server Process (ASP) Statistics Table Application Server (AS) Table ASP-AS Table ASRoute Table ASRouteAs Table Abbreviations: AS - Application Server ASP - Application Server Process ASPAC - ASP ACtive message ASPDN - ASP Down message ASPIA - ASP InActive message ASPUP - ASP UP message CIC - Circuit Identifier Code for ISUP CLLI - Common Language Location Codes DPC - Destination Point Code DAUD - Destination AUDit DAVA - Destination AVAilable DUNA - Destination UNAvailable DUPU - Destination User Part Unavailable ERR - Error message GTT - Global Title Translation HLR - Home Location Registry ISDN - Integrated Services Digital Network ISUP - ISDN User Part M3UA - MTP3 User Adaptation MGC - Media Gateway Controller used in VoIP MSU - Message Signal Unit MTP - Message Transport Protocol MTP2 - Layer 2 of Message Transport Protocol MTP3 - Layer 3 of Message Transport Protocol NMS - Network Management System OPC - Originating Point Code PC - Point Code QOS - Quality Of Service SCCP - Signaling Connection Control Part SCP - Service Control Point (SS7) SCON - Signaling link CONgestion SCON0 - Signaling link CONgestion level 0 (no congestion) SCON1 - Signaling link CONgestion level 1 SCON2 - Signaling link CONgestion level 2 SCON3 - Signaling link CONgestion level 3 SG - Signaling Gateway SGM - Signaling Gateway Mate SGMP - Signaling Gateway Mated Protocol SCTP - Stream Transmission Protocol(RFC 2960) SI - Signaling Indicator SIO - Service Indicator Octet (SS7) SNMM - Signaling Network Management Message SSN - Subsystem Number for SCCP SUA - SCCP User Adaptation TUP - Telephone User Part TT - Title Translation VIP - Versatile Interface Processor XUA - M3UA, SUA or SGMP Brief description: The Signaling Gateway (SG) on the ITP receives the SS7 Message Signal Units(MSUs), converts them to M3UA/SUA messages and routes them to the ASPs over SCTP/IP association. The routing of the message depends on the routing information present in the message and the routing keys configured as part of the ASes. There can be one or more instances of M3UA/SUA at the SG. These instances are identified by a unique port number. Each of these instances can have one or more IP addresses which form 'local' end of the multi-homing SCTP association. The Application Server Process (ASP) is a remote entity which has its own port number and one or more IP addresses to form the 'remote' end of the multi-homing SCTP association. Examples of ASPs are MGCs, IP SCPs or IP HLRs. Application Server (AS), as described in section '1.2 Terminology' of M3UA/SUA draft, is a logical entity serving a specific Routing Key. An example of an AS is a virtual switch element handling all call processing for a unique range of PSTN trunks, identified by an SS7 SIO/DPC/OPC/CIC_range. Another example is a virtual database element, handling all HLR transactions for a particular SS7 DPC/OPC/SCCP_SSN combination. The AS contains a set of one or more unique ASPs of which one or more is normally actively processing traffic. Note that there is a 1:1 relationship between an AS and a Routing Key. An ASP can serve one or more ASes and an AS can have one or more ASPs. An ASP while serving an AS can be active, inactive or down. When one or more ASPs for an AS is active, the AS is active. When all ASPs for an AS are inactive, the AS is inactive. The state of the AS is maintained in one object, whereas, the state of an ASP is maintained for each AS that it serves in ASP-AS table. The SGs are always deployed in mated pairs to provide high availability and redundancy. The SG mates exchange the state of ASes. When an AS is down on one SG, it can route the SS7 message to its mate which can properly route that SS7 message.