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SONIC WALL SITE-SITE VPN having troubles.

Last Modified: 2017-01-30
I have three sites with SonicWall Tz 205 at HeadOffice with TZ205 at one office and TZ 105 in other. Topology is that 2 branch offices are connected to HO through SITE-SITE VPN.

Subnet Details are:

Head Office:
X1 : Connected to WAN
X0 : / 24 (LAN SUBNET)
Single class is used i have total of just 50 devices inclusing phones so i decided to use single subnet for all offices.

Branch Office:
X1 : Connected to WAN
X0 : / 24 (LAN SUBNET)
DHCP : Off

Branch Office:
X1 : Connected to WAN
X0 : / 24 (LAN SUBNET)
DHCP : Off

I have established SITE-SITE VPN and its up. Remote offices are getting IP's over DHCP through VPN. I have place Avaya IP Office in HO and phones are discovering and obtaining ip through tunnel using DHCP. Issue are.

1. I am unable to ping any device over VPN.
2. Avaya phones are connecting but calls dicsconnects after 5 min. It is only in remote office over vpn.
3. No device expect avaya phone is getting IP through VPN.

Please guide. . .
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