4263 __sip_reliable_xmit: Serious Network Trouble

Hello, I have installed asterisk server where my softphone clients are registered. I am making a call to another server.

When I reload the config file I get the below error.
ERROR[2456]: chan_sip.c:4263 __sip_reliable_xmit: Serious Network Trouble; __sip_xmit returns error for pkt data

Please help to resolve this issue.

The configuration on sip.config and extension.config is as below

sip.conf

[general]
context=public
allowoverlap=no
udpbindaddr=0.0.0.0
tcpenable=no
tcpbindaddr=0.0.0.0
transport=udp
srvlookup=yes

[IPtest]
host=X.X.X.X
type=peer
secret=test
context=from-trunk
qualify=yes
insecure=port,invite
canreinvite=no
media_address=X.X.X.X

extensions.conf

[from-trunk]
exten => 0XXXXXXXXXX,1,Dial(SIP/IPtest)

Media addrress it is define on the general section, also that error you display it is most of the time related to misconfiguration on the sip configuration