[Asterisk-Users] Connecting PBX to Asterisk

[Antonio Rabena]

Im trying to inter-connect my current PBX system and Asterisk.  Asterisk 
has some users from different networks (internet).. I used cisco router 
using 4 fxs  to pbx and SIP to asterisk.

Is there any way i can allow the ip address of cisco to connect to my 
asterisk using SIP?  IP Address of cisco is 192.168.0.254

here's a part of my sip.conf


[general]
port = 5060
bindaddr = 0.0.0.0
context = default
srvlookup = yes
pedantic = yes
tos=lowdelay
maxexpirey=360
defaultexpirey=120
disallow=all
allow=ulaw
allow=alaw

[2101]
type=friend
context=sip-users
secret=xxxx
host=dynamic
username=2101
qualify=yes
nat=yes
canreinvite=no



and my extensions.conf

[sip-users]
exten =>_21XX,1,Dial(SIP/${EXTEN}@192.168.0.225)

[default]
exten s,1,Hangup


Regards,


Antonio Rabena