Nathelper sends a Via header with IPv6 address with no square brackets
This cause parsing errors on the receiving side and all kinds of unhappy packets in the universe and Internet of SIP.
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Via: SIP/2.0/UDP FFFF:67C:FFD8:E07F:0:0:0:8:5060;branch=0
should be
Via: SIP/2.0/UDP [FFFF:67C:FFD8:E07F:0:0:0:8]:5060;branch=0
The syntax for the host part says IPv6 reference.
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Committed fix to master. Needs backport to 4.3 / 4.2 but the code is a bit different there. Tested - it works
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Closed #363.
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Note: The code hard codes "UDP" but for both IPv4 and IPv6 one may need keepalives even on TCP connections, unfortunately. That may be another bug to fix.
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Olle E. Johansson