andychicago
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PSTN FALLBACK
Hi
I have two cisco 3845 routers with CME installed on them.I made a call through WAN from one phone to another.Then i took out the WAN connection and the call went through PSTN.
My question is SRST is used for PSTN fallback.Without SRST why do you think the call goes thru PSTN.
can someone expalin the difference between CME and SRST exactly.
I have two cisco 3845 routers with CME installed on them.I made a call through WAN from one phone to another.Then i took out the WAN connection and the call went through PSTN.
My question is SRST is used for PSTN fallback.Without SRST why do you think the call goes thru PSTN.
can someone expalin the difference between CME and SRST exactly.
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ASKER
Thanks for the reply and thanks for letting me know about transtion rules.
Can you tell me whether Call Mangaer Express automatically detects the WAN failure and selects the PSTN route.
Can you tell me whether Call Mangaer Express automatically detects the WAN failure and selects the PSTN route.
I'm not sure if its CME or the ios, the router finds the best match for the number dialed.
If it has a working number it uses that other wise it will use the .T if configured.
This is good example.
http://cciev.wordpress.com/2006/06/17/dial-peer-matching/
Greg
If it has a working number it uses that other wise it will use the .T if configured.
This is good example.
http://cciev.wordpress.com/2006/06/17/dial-peer-matching/
Greg
ASKER
HI
can you explain how to set up fallback on router.I am not using call manager.I will be using cme router and other router i will enable srst on cme router.
can you explain how to set up fallback on router.I am not using call manager.I will be using cme router and other router i will enable srst on cme router.
I think SRST is only used when you are using CUCM. It keeps everything working when the connection is broken. However as you will not be using CUCM this is not an issue.
Greg
Greg
ASKER
Hi
So do you think Call Manager Express takes analog path when it detects WAN failure.
So do you think Call Manager Express takes analog path when it detects WAN failure.
Yes
if you have a dial peer phone number 1001 which is on a remote site and your WAN fails it will try to connect to 1001 by using the next best matching rule.
If you have a .T rule this will be a match for 1001 and you will NOT be connected to your remote site as your local exchange does not have a route for 1001
Greg
if you have a dial peer phone number 1001 which is on a remote site and your WAN fails it will try to connect to 1001 by using the next best matching rule.
If you have a .T rule this will be a match for 1001 and you will NOT be connected to your remote site as your local exchange does not have a route for 1001
Greg
ASKER
MY architecture looks as below
7961 IP PHONE-----ROUTER(CME)-----
The cloud has both WAN and PSTN.I have dial peers for these routers and i am currently using 1xxx destination patterns.I gave the dialpeers for both voip and and for pstn.
MY question is will PSTN fallback works in CME routers also becoz it is happening in my case.