Permission issue

Hi! I am new to FreePBX and i have an issue.

I want to call an outbound route using this trunk. I get this error in CLI when I call the number using one of my extensions.

Executing [[email protected]:22] Dial(“SIP/100-00000006”, “SIP/TEST/011912266653366,300,”) in new stack
== Using SIP RTP TOS bits 184
== Using SIP RTP CoS mark 5
[2014-08-08 09:13:04] WARNING[14930]: chan_sip.c:3713 __sip_xmit: sip_xmit of 0x7f8a3824eed0 (len 1120) to :5060 returned -1: Operation not permitted

Can you please help me with this isssue. Is it a problem with my system or the other party has not allowed my ip yet.

Will appreciate your help.