Grandstream Peer to Peer Gateways Configuration

Scenario:
In this scenario we will explain how to use the Grandstream GXW410x and GXW400x to extend an Analog Line over IP without a SIP Server).


Important:
1. Please upgrade firmware on the GXW400x to 1.0.9.1 and GXW410x to 1.3.4.13 or later prior to configuring. 
2. Ensure both devices can reach each other via their WAN interfaces. This scenario is based on both devices connected to the same subnet (10.1.1.0/24).

GXW400x Configuration:
Basic Settings:
 IP Address: 10.1.1.40
 Subnet Mask: 255.255.255.0
 Default Router: 10.1.1.1
 DNS Server 1: 10.1.1.1
Profile 1:
 Primary SIP Server: 10.1.1.41
 SIP Registration: No
 Outgoing Call without Registration: Yes
 NAT Traversal: No

GXW410X Configuration:
Basic Settings:
 IP Address: 10.1.1.41
 Subnet Mask: 255.255.255.0
 Default Router: 10.1.1.1
 DNS Server 1: 10.1.1.1
FXO Lines: 
 Channel Dialing to PSTN
  1. Wait for Dial-Tone: ch1-4:N; (Y or N, whichever suits your FXO lines)
  2. Stage Method: ch1-4:1;
 Channel Dialing to VoIP
  1. Unconditional Call Forward:
     User ID: ch1-4:7000; (must have a user id any number will work i.e. 7000)
Channels:
 Phone Number Settings
  Channel(s): 1
  SIP User ID: 5060
  Profile ID: Profile 1
 Channel Specific Setting
  3. Local SIP Listen Port: ch1-4:5060++;
Profile 1:
 SIP Server: 10.1.1.40
 SIP Registration: No
 NAT Traversal: No