Will Blocking internal DN's as incoming Calling Party ID's break SRST?

[RAustin70]

Good Morning, 

     My customer is frustrated with telemarketing calls that appear to be coming from internal DNs (280-433-xxxx) and has asked me to block these from reaching our devices.  My immediate concern was for the two remote sites we have that use SRST when the WAN link goes down.

   I guess first dumb question is - what would the caller ID show if we were in SRST and a remote device called my desk here at the mainsite?  I am unsure if it would be the POTS #, or the end device # & I can't test it right now.

[Mohammed al Baqari]

It won't be your local DNs. It will be the PSTN version of it (for example
if the DN is 7831 then the calling number will be for example 7138227831).

[RAustin70]

Hmm, Okay, so to be clear using your example, our internal DN is 7 digit 8227831.  Our PSTN sends us 4 digits 7831 and we add the 822 then route the call.

So if Remote site device 8225555 makes a call to 8227831 while in SRST, it goes out one of the 4 POTS lines, lets say it is 3397878, on the ISR4k out there, and comes into our ISR4k for routing.  Will PSTN be showing calling party # as 3397878, or as 8225555?

We basically need the ability to block all calling party #'s of 713822xxxx without breaking SRST.

[Mohammed al Baqari]

It will be 3397878