[Asterisk-Users] Sip Trunk config / Least Cost Routing

[Wade Weppler]

> Why use an AGI?  This seems to be easily done with the dialplan,
> unless I'm missing some additional sophistication that you're not
> mentioning.

	Our local area (Toronto) has some extreme overlapping areacode
problems that require some logic to decipher.  I've been able to pull
exchange data into a MySQL database (NPA/NXX codes) to help with the logic,
and it's worked quite well.

	For instance, I'm currently in areacode 905, but not all 905
areacodes are a local call for me.  Our satellite office is in areacode 416,
where additional 905 areacodes are a local call that we can then use for our
other office.

	The AGI works quite well.  I may even post it somewhere if anyone
wants it.  Here's the basic logic:

	1)	Offices are assigned an "exchange" number that includes all
of the NPA/NXX codes that are local to that exchange (Toronto has over 1300
combinations).  NPA, NXX, and exchange are all stored in a MySQL database.
	2)	The AGI script is passed the local exchange number and the
dialed LD number.  If the dialed number appears in any other exchange in our
database, the call is passed through the proper office.  If it doesn't
appear, the LD call is made over the local telco.

	Exchanges are modified constantly, so keeping up with NPA/NXX
changes can be a fulltime job!

> TRIP (RFC2871 and RFC3219)   Not implemented in Asterisk yet -
> looking for programmers.  See my posts to the -dev list last month.

	I'll have to do some digging on this.  I'm assuming this exposes a
lot more information at each office (ie. line availability) than anything we
can do in Asterisk today?

-wade