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hi path signaling surviability
- Thread starter cowboy72
- Start date
Iamnothere
Technical User
What version is the HiPath 4000? If it is "V6 R2", then there is a new option: Signaling Survivability via Alternate LAN. If less than V6 R2, then you will need to use the traditional method.
Since it is unlikely that you have a V6R2 system (latest greatest), I will provide some generic info regarding the TRADITIONAL installation of Signaling Survivability. A modem (analog or ISDN) must be installed at each IPDA location. Each modem will need a trunk circuit - provided by the Telephone Company. The modem at the IPDA location needs to be properly configured and connected to the NCUI board's serial port labeled "MODEM". At the Host site, you will need to install a new router, capable of supporting modems. Whatever modem technology you used at the IPDA location, you must match that technology at the Host location (analog or ISDN). This router must also be custom configured.
AMO commands must be performed so that the 4K is aware that Signaling Survivability is present.
Here is how it works, using DEFAULT timing parameters: every 0.5 seconds, a TCP keep-alive packet is sent from the active Switching Unit to each IPDA. If there is a problem in the customer's network, and the NCUI cannot receive or respond to the keep-alive, then the Host goes into "Signaling Survivability" mode for that particular site. But first a parameter called SUPVTIME must expire (60 seconds). If the problem is resolved within that 60 seconds, everything returns to normal. If not, the next parameter begins: ALVTIME - also 60 seconds. During this 60 seconds, calls will continue to remain up, but when this 60 second timer expires, the Host will shift sending the signaling packets for this IPDA from their normal path to the Signaling Survivability router. Inside the Signaling Survivability router, when one packet is seen with the "Destination" IP Address equal to the IP Address of the IPDA, then that router enables a modem and dials a pre-configured telephone number - which is the telephone number of the circuit at the IPDA for the modem. The call is answered by the modem at the IPDA, some hand-shaking occurs, and the NCUI acknowledges that it has a "Survivability IP Address" (see AMO SIPCO -> LSNET -> parameter "SURVNET". When the NCUI acknowledges its identity on this Survivability Network, the call connects to the NCUI, and signaling begins to flow from the Switching Unit -> Signaling Survivability router -> Modem -> Telco -> IPDA Modem -> NCUI.
This connection is SIGNALING ONLY. With only this portion of the job completed, the users at this IPDA location will be able to place internal station-to-station calls on their IPDA shelf, but more than likely they will not be able to call to the Host, because the network problem that effected the Signaling most likely also impacted the Speech Path as well. If there are external trunks on this IPDA, the users will be able to place external calls via those trunks, assuming that all of that LCR Routing has been performed in advance.
To work at its FULL CAPABILITY, "Payload Survivability" should also be configured. Payload Survivability allows the customer to continue to dial users at the Host by station number, and these station numbers are converted to Public Telephone Numbers, the calls use the IPDA's external trunks - then ring in at the Host as Direct Inward Dialing (DID) calls. There are three methods to configure Payload Survivability: EASY, DIFFICULT, and EVEN MORE DIFFICULT.
If you truly have 15 licenses for Signaling Survivability, and you want the ability to support all 15 shelves if they crash simultaneously, then you will need a Signaling Survivability router that can support multiple modems. You can install up to 10 Signaling Survivability routers, so some routers must support more than 1 modem.
As you can see, this feature requires monthly expenses for trunks, many modems, additional routers, and most importantly - the know-how. This task is not a simple MAC. I highly recommend that you engage your next level of support for this type of installation. An inexperienced person can EASILY take down the HiPath 4000 IPDA!!!
Since it is unlikely that you have a V6R2 system (latest greatest), I will provide some generic info regarding the TRADITIONAL installation of Signaling Survivability. A modem (analog or ISDN) must be installed at each IPDA location. Each modem will need a trunk circuit - provided by the Telephone Company. The modem at the IPDA location needs to be properly configured and connected to the NCUI board's serial port labeled "MODEM". At the Host site, you will need to install a new router, capable of supporting modems. Whatever modem technology you used at the IPDA location, you must match that technology at the Host location (analog or ISDN). This router must also be custom configured.
AMO commands must be performed so that the 4K is aware that Signaling Survivability is present.
Here is how it works, using DEFAULT timing parameters: every 0.5 seconds, a TCP keep-alive packet is sent from the active Switching Unit to each IPDA. If there is a problem in the customer's network, and the NCUI cannot receive or respond to the keep-alive, then the Host goes into "Signaling Survivability" mode for that particular site. But first a parameter called SUPVTIME must expire (60 seconds). If the problem is resolved within that 60 seconds, everything returns to normal. If not, the next parameter begins: ALVTIME - also 60 seconds. During this 60 seconds, calls will continue to remain up, but when this 60 second timer expires, the Host will shift sending the signaling packets for this IPDA from their normal path to the Signaling Survivability router. Inside the Signaling Survivability router, when one packet is seen with the "Destination" IP Address equal to the IP Address of the IPDA, then that router enables a modem and dials a pre-configured telephone number - which is the telephone number of the circuit at the IPDA for the modem. The call is answered by the modem at the IPDA, some hand-shaking occurs, and the NCUI acknowledges that it has a "Survivability IP Address" (see AMO SIPCO -> LSNET -> parameter "SURVNET". When the NCUI acknowledges its identity on this Survivability Network, the call connects to the NCUI, and signaling begins to flow from the Switching Unit -> Signaling Survivability router -> Modem -> Telco -> IPDA Modem -> NCUI.
This connection is SIGNALING ONLY. With only this portion of the job completed, the users at this IPDA location will be able to place internal station-to-station calls on their IPDA shelf, but more than likely they will not be able to call to the Host, because the network problem that effected the Signaling most likely also impacted the Speech Path as well. If there are external trunks on this IPDA, the users will be able to place external calls via those trunks, assuming that all of that LCR Routing has been performed in advance.
To work at its FULL CAPABILITY, "Payload Survivability" should also be configured. Payload Survivability allows the customer to continue to dial users at the Host by station number, and these station numbers are converted to Public Telephone Numbers, the calls use the IPDA's external trunks - then ring in at the Host as Direct Inward Dialing (DID) calls. There are three methods to configure Payload Survivability: EASY, DIFFICULT, and EVEN MORE DIFFICULT.
If you truly have 15 licenses for Signaling Survivability, and you want the ability to support all 15 shelves if they crash simultaneously, then you will need a Signaling Survivability router that can support multiple modems. You can install up to 10 Signaling Survivability routers, so some routers must support more than 1 modem.
As you can see, this feature requires monthly expenses for trunks, many modems, additional routers, and most importantly - the know-how. This task is not a simple MAC. I highly recommend that you engage your next level of support for this type of installation. An inexperienced person can EASILY take down the HiPath 4000 IPDA!!!
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