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Wont reregister while TCP retransmissions.
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btu00 Offline
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Wont reregister while TCP retransmissions.

I have a T41P handset. Whist it is all working there is no problem, However if I break the link to the internet on my router and reconnect it then the TP41 will not reregister for about 15 minutes.

So a wireshark trace shows that the SIP message (I have seen it happen on a sip register and a sip subscribe) starts a TCP retransmission of the packet. (because the wan was broken and no reply was received) . This retransmission happens quickly at first and then slows to about once ever 30 seconds. Other NTP and DNS functions continue to happen around this but no further SIP happens until the TCP retransmission stop, why they stop I do not know, timer expiry or count expiry?? but it takes 12 to 15 minutes then SIP register will happen again and all is ok.

Any Ideas please?

08-26-2014 10:22 AM
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Wont reregister while TCP retransmissions. - btu00 - 08-26-2014 10:22 AM

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