asterisk users - Feb 2007 - No Ringback, only on 1 SIP provider

Hi,

I have the following situation:  At a branch , there is a Cisco Call Manager
with users all having
Cisco phones.  Now I put down a Asterisk 1.2.12 box at the branch, which talks
H323 via chan_oh323
to the CCM.  So calls go from the CCM, go H323 to the local Asterisk box, then I
take it via SIP to
another Asterisk box.  From there I am hooked up to 2 different providers, for
Local and
International, both via SIP.  The problem I am having is that the users dont get
ringback (ringing
indication) when they dial International numbers, yet it works perfectly when
they dial Local
numbers.  Yet, to test, from a hardphone plugged into Asterisk2, I get ringback,
so its not the
Interntional provider, it must be the SIP trunk from Asterisk1 to Astrisk2.


                                                                 (ringback)
                                                              NationalProvider
                                                                   |
                                                                SIP|
                                                                   |
                               H323                   SIP          |     SIP    
(no ringback)
Users phones -----> CCM 4.1 -------->
Asterisk1------------->Asterisk2---------InternationalProvider
                                                                   |
                                                                   |
                                                                ZAP hardphone

Here is the sip.conf from Asterisk1.

[N_G]
type=friend
host=10.255.255.1
username=N_G
secret=N_G
disallow=all
allow=g729
canreinvite=no
qualify=yes
progressinband=yes (tried this yes/no/never, made no difference)

When I call goes from Asterisk1 to Asterisk2, I get the 'making progress
passing it to xxx', but I
dont hear ringing, then the person answers.



-- 
thanks,
Yusuf