Here I’m using Grnadstream FXO Gateway GXW4104
Login to GXW4104
Select Profile 1
SIP Server: IP address of Asterisk box
SIP Registration: No

Select FXO Lines
4. Unconditional Call Forward to VOIP: ch1-4:604;

Here 604 is the extension which the incoming call to be routed in asterisk.

In Asterisk , edit the following files.


trunkname = Grandstream
trunkstyle = voip
type = peer
context = DLPN_incoming
host = IP address of Grnadstream Gateway
hasexten = no
hassip = yes
insecure = port
canreinvite = no
allow = all


exten = _X.,1,Macro(trunkdial-failover-0.3,SIP/gxw4104/${EXTEN})

include = CallingRule_Call_out

exten = 604,1,Dial(SIP/604)

It will be available in Asterisk-GUI after reloading asterisk.


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