MGCP fall back

[iptuser]

Is there a difference betwen SRST and MGCP fallback

 

[jeter]

Can you explain further what you are asking?

SRST is when the router takes over your phones in fallback mode. You will need to program your router with dial peers for inbound and outbound calls....

MGCP fallback is when you loose connection with call manager and mgcp endpoints are lost... Thus placing the router into SRST mode... Once the connection to call manager is re-established then mgcp will come back on line and the phones will come out of SRST mode...




SPC NVARNG
Tek-TIP Member 19,650

 

[iptuser]

That`s what I know but from the extract below is seems different, a qoute from the SRST guidge MGCP Gateways and SRST " MGCP fallback is a different feature then SRST and, when configured as an indiviudal featuer, can be used by a PSTD Gateway"

thanks

wayne

 

[whykap]

So it is exactly what it says. MGCP fallback allows you to register the router to another call manager server if the primary server goes down. If you do not have MGCP fallback your PSTN gateway will not function in case of failure of the primary MGCP option, but the phones will still stay registered.

SRST is in case of WAN failure, therefore no callmanager servers are visible. In this case all phones will register to the local SRST router and the local PSTN service will function using h323.

 

[iptuser]

But do you not do this via the ccm-manager redundant x.x.x.x commend?

 

[pndscm]

MGCP fallback is used DURING SRST to have your PRI's 'D' channel re-terminate to the router. When the PRI is set up as MGCP the 'D' channel is backhauled to the CallManager normally. But when all the CCM's are unreachable, it needs to re-term to the SRST router. To tell it to do so you use MGCP fallback. Your normal SRST programming will account for analog ports on the Gateway.
You are correct that the 'ccm-manager redundant x.x.x.x' command tells the Gateway about the secondary CCM to register to when the primary goes down.
While similar MGCP fallback and CCM-Manager redundant commands really are different in that MGCP Fallback is kind of the 'last resort'. If you have mutliple CCM's you would use both commands on an SRST router with a PRI.

 

[whykap]

Don't know what I was thinking when I was typing above but pndscm is right on. Sorry for misinforming you on this one.

 

[iptuser]

many thanks to all