[cisco-voip] CER for Europe... variable length dial plan and PSAP callback

[Jonathan Charles]

We currently have offices throughout Western Europe and each site currently
has a PRI/T1-CAS/Analog nightmare...

We are implementing centralized SIP (ATT) out of London and we need to make
sure 112/999 calls get directed to the proper nation's PSAP.

We would also like to support callback.

So, we spun up a CER cluster in Europe...

First thing we found, CER only supports one entry point (so, we picked 112,
and translate 999 in the UK to 112 and match an ERL that changes this back
to 999 and tags a UK DID). This seems to work fine (albeit clunkily).

The real problem is call back...

CER also only supports one entry point for callback.... the problem is we
have a variable length dial plan with + then 10, 11, 12 and 13 digits (each
with 2 digit country codes).


So, how do we do callback?

First idea was to pay digits on the end in CER, strip them off on the
outbound via SIP and then pad them back in on the inbound back to CER to
route them to the station.

Is this crazy?


Thanks!


Jonathan
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