conneting two asterisk servers encountering problem

I'm new to Asterisk and SIP/VOIP in general. What I am trying to accomplish, is to have one main office using Asterisk and local SIP telephones (Polycom) connect to a SIP provider for outbound calls. We have another office located in another city with Polycom phones, so I'm trying to create a second server there, connect it to the main server, and use the main server for outbound calls to the provider.

I have the main server successfully connected to the provider and I can send/receive calls.

I have the secondary server connected to the main server and I can see that it is successfully registering. I'm using SIP instead of IAX to connect the two * servers.

I'm trying to use a phone at the secondary office to call an extension at the main office. The call doesn't seem to be getting routed correctly. Running asterisk on the secondary server with -vvv shows congestion errors (on the sending * server) when I try and connect to an extension on the other side.

I think this is a syntax issue on my part because I'm not fully understanding the documentation I'm reading. My config is posted and detailed below.

As far as network topology, both * servers are behind standard consumer routers that have a single public IP and using NAT. I'm using port forwarding to forward SIP and the entire range of RTP ports to the * server on both sides.

##########################################
# Main Office Asterisk Server (name "radar")
# ========================================
# Connects to VOIP Provider for outbound calls
# Accepts connections from local SIP phones
# Accepts SIP peer connections from satellite asterisk server
# Sits behind a standard consumer router with NAT using port forwarding
###########################################
 
sip.conf:
-------------------------------
[general]
localnet=192.168.0.0/255.255.0.0
externip=xxx.xxx.xxx.xxx
register => <user>:<pass>@sip.inphonex.com
register => <user>:<pass>@sip.inphonex.com
register => <user>:<pass>@<asterisk2 server>/gladiator
 
 
[gladiator]
type=friend
secret=xxxxx
context=gladiator_incoming
host=dynamic
disallow=all
allow=ulaw
nat=yes
 
[102]
type=friend
host=dynamic
secret=polycom
context=bob
 
 
[inphonex]
username=<user>
type=peer
secret=<pass>
host=sip.inphonex.com
fromuser=<user>
fromdomain=sip.inphonex.com
context=from-inphonex
canreinvite=no
 
[inphonex2]
username=<user>
type=peer
secret=<pass>
host=sip.inphonex.com
fromuser=<user>
fromdomain=sip.inphonex.com
 
 
extensions.conf:
--------------------------------
[general]
static=yes
writeprotect=no
clearglobalvars=no
 
[globals]
 
 
[gladiator_incoming]
exten => 102,1,Dial(SIP/102)
exten => _NXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex,30,Tt)
exten => _NXXXXXX.,n,Congestion()
exten => _NXXXXXX.,n,Hangup()
exten => _NXXNXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex,30,Tt)
exten => _NXXNXXXXXX.,n,Congestion()
exten => _NXXNXXXXXX.,n,Hangup()
exten => _1NXXNXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex,30,Tt)
exten => _1NXXNXXXXXX.,n,Congestion()
exten => _1NXXNXXXXXX.,n,Hangup()
 
 
[tom]
exten => 101,1,Dial(SIP/101)
exten => 600,1,Answer()
exten => 600,2,Playback(demo-echotest) ; Let them know what
exten => 600,3,Echo()                  ; Do the echo test
exten => 600,4,Playback(demo-echodone) ; Let them know it
exten => 600,5,Hangup()
exten => _NXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex,30,Tt)
exten => _NXXXXXX.,n,Congestion()
exten => _NXXXXXX.,n,Hangup()
exten => _NXXNXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex,30,Tt)
exten => _NXXNXXXXXX.,n,Congestion()
exten => _NXXNXXXXXX.,n,Hangup()
exten => _1NXXNXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex,30,Tt)
exten => _1NXXNXXXXXX.,n,Congestion()
exten => _1NXXNXXXXXX.,n,Hangup()
 
[bob]
exten => 102,1,Dial(SIP/102)
exten => 600,1,Answer()
exten => 600,2,Playback(demo-echotest) ; Let them know what
exten => 600,3,Echo()                  ; Do the echo test
exten => 600,4,Playback(demo-echodone) ; Let them know it
exten => 600,5,Hangup()
exten => _NXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex2,30,Tt)
exten => _NXXXXXX.,n,Congestion()
exten => _NXXXXXX.,n,Hangup()
exten => _NXXNXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex2,30,Tt)
exten => _NXXNXXXXXX.,n,Congestion()
exten => _NXXNXXXXXX.,n,Hangup()
exten => _1NXXNXXXXXX.,1,Dial(SIP/${EXTEN}@inphonex2,30,Tt)
exten => _1NXXNXXXXXX.,n,Congestion()
exten => _1NXXNXXXXXX.,n,Hangup()
 
 
 
##########################################
# Secondary Office Asterisk Server (name "gladiator")
# ========================================
# Connects to main office asterisk server for extensions and outbout calls to provider
# Accepts connections from local SIP phones
# Sits behind a standard consumer router with NAT using port forwarding
###########################################
 
sip.conf:
-----------------------------
 
[general]
register => <user>:<pass>@98.175.96.233/radar
externip=98.163.74.196
 
[radar]
type=friend
secret=welcome
context=radar_incoming
host=dynamic
disallow=all
allow=ulaw
nat=yes
 
[101]
type=friend
context=tom
host=dynamic
secret=polycom
 
 
 
extensions.conf:
--------------------------
 
[globals]
 
[general]
autofallthrough=yes
 
 
 
[radar_incoming]
exten => 102,1,NoOp()
exten => 102,n,Dial(SIP/radar/${EXTEN})
exten => 102,n,Hangup()
 
 
[tom]
exten => 102,1,NoOp()
exten => 102,n,Dial(SIP/radar/${EXTEN})
exten => 102,n,Hangup()
 
exten => _NXXXXXX.,1,Dial(SIP/radar/${EXTEN})
exten => _NXXXXXX.,n,Congestion()
exten => _NXXXXXX.,n,Hangup()
 
exten => _NXXNXXXXXX.,1,Dial(SIP/radar/${EXTEN})
exten => _NXXNXXXXXX.,n,Congestion()
exten => _NXXNXXXXXX.,n,Hangup()
 
exten => _1NXXNXXXXXX.,1,Dial(SIP/radar/${EXTEN})
exten => _1NXXNXXXXXX.,n,Congestion()
exten => _1NXXNXXXXXX.,n,Hangup()

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