Hi,
      I have one elementary question, when UAC wants to establish a session
he has to send INVITE message, so here my question is building up of INVITE
message is said to be parsing, so can we say this to be encoding because
here the structures written will be filled up by respective values, and once
message gets construct it will be placed in buffer to hand over to TCP/UDP,
so can we say all this process to be parsing.

             When any SIP message is received by say PROXY, it has to decode
the message and has to take action depending up on the message.

                  As the bottom most layer of SIP protocol does Parsing and
Encoding of message. Is there any difference between Parsing and Encoding or
both are same. Can we say that Parsing happens when message is sent, and
decoding happens when message is received.

              Please correct me if I am wrong, and send me feedback to get
exact understanding. Else give me exactly  what happens at bottom most layer
of SIP Protocol.

            As we know that proxy will route the request to respective
destination, here I am confused that as I read in one document stating that,
as the NETWORK SERVER (PROXY)  whenever receives 18XX response it has to
immediately proxy it, can any one explain here what is meant by *proxy the
18XX response.*

             I am eagerly waiting for reply.


Thanks & Regards.
  Sharif.
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