SS7/IP CONCEPTOS EN EL ENTORNO SIGTRAN Signalling point A MSC (Server) Signalling point B Association Set SCTP Association CCSU_0 MGW (Client) ISU_0 IP CCSU_1 CCSU_2 ISU_1 ISU_2 CM CM SPC_1 IP Addresses SPC_2 • Con el uso de IP, cada LINK de Señalización está asociado con 1 ASSOCIATION SET • 1 ASSOCIATION SET puede conformarse de hasta 32 ASSOCIATIONS (Envío de Mensajes DESORDENADOS) • 1 ASSOCIATION SET puede conformarse de hasta 16 ASSOCIATIONS (Envío de Mensajes ORDENADOS, donde el SLS se usa para compartir la carga entre los ASSOCIATIONS) • El STATUS de LINK sigue al STATUS del ASSOCIATION SET (El LINK se activará cuando al menos 1 ASSOCIATIONS dentro del ASSOC. SET correspondiente se active. • Cada ASSOCIATION está definido por la unidad de Señalización en la cual existe y por la dirección IP del destino. • Se recomienda configurar ASSOCIATION SET cuyos ASSOCIATIONS esten controlados por distintas unidades de Señalización. (PARA GARANTIZAR REDUNDANCIA Y DISTRIBUCIÓN UNIFORME DE CARGA ENTRE LAS UNIDADES) • El ASSOCIATION SET es un concepto específico de la arquitrectura NOKIA PILA DE PROTOCOLOS SIGTRAN CAP/MAP/.. CAP/MAP/.. BSSAP TCAP ISUP/TUP SCCP ISUP/TUP SCCP MTP3 MTP3 M3UA M3UA MTP2 MTP2 SCTP SCTP MTP1 MTP1 IPv4/IPv6 IPv4/IPv6 SIGTRAN TDM SS7 CAP/MAP/.. CAP/MAP/.. RANAP TCAP BICC BSSAP TCAP SCCPb BICC MTP3b MTP3b SSCF-NNI SSCF-NNI SSCOP SSCOP AAL5/ATM Broadband SS7 RANAP TCAP SCCPb M3UA M3UA SCTP SCTP AAL5/ATM IPv4/IPv6 IPv4/IPv6 SIGTRAN USOS DE SIGTRAN EN REL.4 (MSS) MAP MAP TCAP TCAP SMSC SCCP M3UA SCCP M3UA HLR SCTP SCTP IP IP BICC MSC Server RANAP SCCP SCCPb SCTP M3UA M3UA IP SCTP SCTP IP IP IP M3UA PSTN/ ISDN ISUP BSSAP MSC Server RAN/BSS ISUP MTP3 MGW M3UA SCTP IP MGW MGWs act as Signaling GWs SCTP • • Stream Control Transmission Protocol (RFC 2960) – Packet-oriented delivery – Sequence delivery within multiple streams – Optional multiplexing of user messages into the SCTP datagram (bundling) – Network level fault tolerance (SCTP multi-homing) – Resistance flooding and masquerade attack – SCTP heartbeating Stream Control transmission Protocol (SCTP) Checksum Change (RFC 3309) - described the CRC 32C checksum method M3UA • • • • • Support for the transfer of all SS7 MTP3 user parts messages (e.g. ISUP, SCCP, TUP etc.) Support for the seamless operation of the MTP3 user protocol peer Support for the management of SCTP transport associations Support for MGC (Media Gateway Controller) fail over and load sharing Support for asynchronous reporting of status changes to network management – SG (Signaling Gateway) – ASP (application Server Process) – process instance of an Application Server ESTRUCTURA DEL MENSAJE DE M3UA CONFIGURACIÓN DE SIGTRAN 1. Create an association set (OYC) ZOYC:<association set name>:<role>; 2. Add associations to the association set (OYA) ZOYA:<association set name>:<unit type>,<unit index>:[source port number]:<first destination IP address>,[netmask length]:[second destination IP address,[netmask length]:<parameter set name>; 3. Check the associations (OYI) ZOYI::; 4. Give IP addresses to own signalling units ZQRN 5. Add IP addresses for SCTP multihoming (OYN) ZOYN:<unit type>,<unit index>:<IP address version>: <primary source IP address>,[secondary source IP address]; 6. Create IP type SS7 signalling link and link set (NSP) ZNSP:<signalling network>,<signalling link point code>,<signalling link set name>,<signalling link number>:<association set>; 7. Create signalling route set (NRC) ZNRC:<signalling network>,<signalling point code>, <signalling point name>,<parameter set number>,<load sharing status>,<restriction status>:<signalling transfer point code>,<signalling transfer point name>,<signalling route priority>; 8. Activate the IP configuration ZNLC:<signalling link number>,<state>; Note Cuando el usuario Activa el Link de Señalización, el Sistema automáticamente intenta activar los ASSOCIATION que pertenecen al ASSOCIATION SET correspondiente. El Link de Señalización estará Activo, Si al menos 1 de los ASSOCIATIONS que pertenecen al ASSOCIATION SET se activa.
