Send RESTART to Telco from ios

Question

Hi all!
Not sure if this is placed correctly but I´ll give it a try :-)
We have a lot of isdn connections in various countries in europe. All Telcos have different ways of handling isdn interfaces, some require a restart to be sent when bouncing the isdn-interface (let´s say, taking the router/cube/voice gw/whatever down for maintenance). Some voicegw:s run mgcp via cucm and here we can check or uncheck the "inhibit restart bla bla bla" in cucm configuration. Some voicegw:s run h323 or and sip. Is there a way to send a RESTART to the Telco from ios (towards the Telco) ?
We have some use cases where the Telco is blocking the channels after a reload (not verified with Telco - bu we just se something like "channel/circuit unavailable" on outgoing calls). Eventually something times out and we get a restart from the Telco side and things start to work again. IT would be nice if one could trigger a restart from the cpe-side
I found this command that I put in, but it does not seem to stick, it does not show up in "sh runn" or "sh runn all"
int serial 0/0/0:15
(config-if)#isdn layer         
(config-if)#isdn layer2-flap RESTART
What is it used for, or is there any other way?
Please advice, to be able to "kick" the Telco from our side with a RESTART would be a really valuable tool :-)

Answer 1

Hi Bjorn,
I tested the command on 2 routers.
On the 3825, running 15.1(4)M7, the command did NOT stick.
On the 3945, running 15.3(3)M1, the remained there after a reload also.
So it's not sticking on the 15.1(4)M ios train. Can you try moving to 15.2 and check if it sticks?
FYI, 15.1(4)M6 is not a safe version of IOS if you have SIP tcp and udp sockets open.
I suggest you take a look at this: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131106-sip
Thanks