TPTAG_REUSE: disabling connection reuse causes responses not to be sent

[ozgurakcali]

Using Sofia Sip with freeswtich, setting reuse-connections to False on the Freeswtich Sofia profile, which sets the TPTAG_REUSE to false on Sofia.

When this is set, the Sofia stack doesn't reuse connections for responses either. So for example, if I send an INVITE to Sofia from a peer, via a TCP connection from a random source port, Sofia does not want to reuse the connection when sending the response, and tries to establish a new connection to the same ip / port pair. But since this is a random source port, the connection fails and the response can't be sent.

I think this behavior is wrong, the flag should not affect the response path, since it will almost always fail to establish a new TCP connection to the peer on the random source port. The flag should only affect the behavior for outgoing connections from the Sofia side.