>> One important thing to consider here is that we did not take care so far
>> of other protocols/transports than UDP (we think our design will allow
>> an easy integration of the others, but we did not 'port' the TCP and TLS
>> implementations over just yet). So a combination of our efforts will
>> hopefully be very beneficial.
>OK. I look forward to seeing your patch. One of the most important things
that we did was to get all of the data for a single socket in a structure,
>and create "choke point" functions for sending and receiving, which is
especially important for TCP and TLS (which both need to deal with
congestion, >partial messages, and multiple messages).
Multiple IP addresses or ports with TCP is quite complex and you definitely
need a structure/class to represent each open TCP call. Correct SIP protocol
requires that responses use the same call as the corresponding request (if
still open) but for requests you have to find or open a call to the
address/port given in the last contact. (Simple calls are fine - it is
things like OPTIONS and re-INVITE by the called party that get messy.) That
means remembering which TCP call a request arrived on and on sending
requests scanning all the TCP calls in use to find if there is one already
open that you can use or opening one. I also found TCP open taking up to 30
seconds (usually due to socket reuse timeouts) so you cannot just freeze
SIPP till a call opens, you have to keep state and poll.
The multiple IP address code we have for UDP was taken from another project
so I was never able to share it. (It is very messy anyway so you probably
would not want it.) However I had to re-write the socket management to get
TCP to work so there is no problem sharing that part and the changes to the
SIPP files if that would help. (It does not include TLS though.)
Peter
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