Folks, I am trying to write a simulator based on SIP (session initiation protocol). When it receives a request, it needs to send a response as follows.
Received request: 
      INVITE sip:bob@biloxi.com SIP/2.0
      Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds
      Max-Forwards: 70
      To: Bob <sip:bob@biloxi.com>
      From: Alice <sip:alice@atlanta.com>;tag=1928301774
      Call-ID: a84b4c76e66710@pc33.atlanta.com
      CSeq: 314159 INVITE
      Contact: <sip:alice@pc33.atlanta.com>
      Content-Length: 0

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And the response must be something like 
      200 SIP/2.0 OK
      Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds
      Max-Forwards: 70
      To: Bob <sip:bob@biloxi.com>
      From: Alice <sip:alice@atlanta.com>;tag=1928301774
      Call-ID: a84b4c76e66710@pc33.atlanta.com
      CSeq: 314159 INVITE
      Contact: <sip:alice@pc33.atlanta.com>
      Content-Length: 0

[download]
Only the first line in the response changes. Everything else is same from received request. This is what I tried but didnt help....
------------------------------------------ 
    my $length = $sock->recv($sip_request,1000);
    print "\nReceived message '", $request,"'\n";

    my @headers = split/\n/, $request;

    my $tmp = 0;
    foreach my $line (@headers)
    {
        if ($tmp gt 0)
        {
            $sip_response = join($sip_response, $line, "\n");
        }
        $tmp++;
    }

    print "Our response is : \n";
    print $sip_response;

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---------------------------------------------
But I am not able to form the proper response. Could any of you help me out?

In reply to splitting and joining a network message by Anonymous Monk

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