I believe you are talking about the iovec scatter/gather method, which reads/writes from multiple buffers in a single call. It should be much faster for a lot of applications, especially UDP. Likely you have to change one line of code to change nssock into a UDP module (of course it might be nice to do that from a config file setting, which is probably what Vlad did if he has written a SIP server).
Change in the nssock driver is minimal, because UDP is much simpler, just one packet, more changes are in the driver itself, i introduced socket type and some buffers.
I can publish the patches, they work fine with asterisk and ser and sipura.
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