asterisk users - Jul 2009 - early-dial SIP 484 "incomplete address", dialplan patterns and international calls

Hi,

I would like to know if someone can suggest me an efficient way of writing a
dialplan to match "variable-length" international calls when using SIP
clients with the "early dial" or 484 feature.

What I usually do for clients that do NOT "early dial" is define
something like this in my outbound context:

For local calls (they fortunately have a fixed length):
exten => _0ZXXXXXXXX, ...

For international numbers (variable length:
exten => _000ZX., ...

etc.

However, as you can expect, "early dial" phones will work fine for
local calls but will fail for international numbers because Asterisk will start
dialing out as soon as it matches, say, 00044, and ignore the digits sent
afterwards.

What would be the most efficient dialplan solution for a mixed client
environment. Should my "_000ZX." logic have to "wait for digits
until timeout"?

Suggestions greatly appreciated.

Vieri