[Asterisk-Users] Does anyone know what this means

[Obelix]

When I try to dial through a pbx I receive this message

 to 216.127.66.119:0
Oct  8 23:53:48 WARNING[22849]: chan_sip.c:611 __sip_xmit: sip_xmit of 0x81331cc
(len 670) to 216.127.66.119 returned -1: Invalid argument
Retransmitting #5 (no NAT):

The line is silent and nothing happens.

/Obelix

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