asterisk users - Feb 2011 - Regarding error in asterisk 1.6.2.16....

Hi every one,
                      When i run asterisk i am getting error as

 ERROR[2109]: chan_sip.c:3963 __sip_reliable_xmit: Serious Network Trouble;
__sip_xmit returns error for pkt data ............


i am unable to understand what it is and how come.......... can any one help
me regarding this issue..........

Hope i get a positive reply......




With Regards,
viswavardhan
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