[Serusers] ipphone---ser---asterisk---ser---pstn

[Iqbal]

Hi

I am setting up the following

ipphone registered with ser, the username on ipphone belongs to special 
group called "asterisk"
when he makes call, I append a prefix, and route his calls to asterisk.

The prefix is appended because I have several "special" groups which all 
hit different extensions in asterisk.

Anyhow this call gets to asterisk, where I then do a few mysql queries 
to find which group/company this user belongs to and then drop them into 
the correct context for their company.

For any of these special users then need to dial 9[number] to route the 
call outside their corporate network, otherwise they can all dial 
internally using 3 digit numbers.

The problem that I have got is that the calls get through okay, and both 
side can talk, but
a) the call setup takes time
b) the sip debug just does not seem correct, in fact its got way too 
much going on for my liking.

setup, iphone ------ser------asterisk
                               |
                               |
                            pstn GW

ngrep
--------
iphone  invite to SER
SER ---100 trying ---> ipphone
SER --- INVITE ---> asterisk
Asterisk ----> 100 trying ----> SER
Atsreisk ----INVITE ----> SER
SER -----100 trying -----> Asterisk
SER -----INVITE ---PSTN GW
PSTN GW ----100 trying -----> SER
PSTN GW ----> 183 session progress ----> SER
SER ---- 183 session progress ----> Asterisk
Asterisk ----183--->ser
ser .-----183 ---> ipphone
PSTN GW ----200 OK ---> SER
SER -----200 OK ---->  Ast
Ast ----ACK ----> SER
SER ----ACK ---> GW
AST ----OK ----> SER
SER ----OK ----IPphone
ipphone ----ACK ---> SER
SER ------ACK ---AST

Now around about here is where I think it should stop, cause it all 
seems to make sense...but heres where is starts to go wrong, I then get

Ast ---INVITE ---> ser
ser ----> 404 User Not found ----> ast
ast ---ack ---> ser
ser ---ack ---> gw
ser ---invite --ast

and various combos of this, but the call is going through. I am 
particularly concerned with the user not found part, since asterisk ip 
is trusted and the call does go through.

Iqbal