Regex insertion

From: sil <dsphunxion@xxxxxxxxx>
Date: Wed, 18 Jul 2007 12:53:59 -0000

I need a regex of sorts that will replace ONLY the line: P-Asserted-
Identity: <sip:+$fU@$tU;user=phone> with:
P-Asserted-Identity: <sip:19998887777@xxxxxxx:5060> (from line 1)

Here is my data:

f:"Operations"<sip:
19998887777@xxxxxxx:5060>;tag=3933ee6e1923de3601d9dab88b1dc4bf
t:<sip:12223334444@xxxxxxxxxxxxxxxxxx>
m:<sip:0-d03365c213c46d247564@xxxxxxx:5060;transport=udp>
i:bf52f59d069087948090769a8a98fcdd-469d50d7@xxxxxxx
CSeq:21796 INVITE
User-Agent: Asterisk PBX
Max-Forwards:16
Date: Tue, 17 Jul 2007 23:29:27 GMT
Allow:INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY
c:application/sdp
l:289
Remote-Party-ID: <sip:+$fU@$tU>;privacy=off;screen=no
P-Asserted-Identity: <sip:+$fU@$tU;user=phone>

1 will always start with "f:"

Maybe...
subst("/From: <sip.*)(@)(.*)/From: <sip:\1\2\3\r\nP-Asserted-
Identity: ?

Is there an alternative say if P-Asserted... was ALWAYS the 13th line

#!/usr/bin/perl

my $sipPacket = 1;
my @packetData = '';

while ( my $line = <> ) {

if ( $line =~ m/^From: <sip.*/ ) {

if ( $sipPacket < 1 ){
pwnPacket(@packetData);
@packetData = '';
}

$sipPacket--;
next;
}

push @packetData, $line;

}

sub pwnPacket {
if ($_[1] =~ /From: <sip.*)(@)(.*)/) {

# Confusion seeps in... How do I insert it into the 13 field...
print "From: <sip:\1\2\3\r\nP-Asserted-
Identity:";

}

So the packet would read:
f:"Operations"<sip:
19998887777@xxxxxxx:5060>;tag=3933ee6e1923de3601d9dab88b1dc4bf
t:<sip:12223334444@xxxxxxxxxxxxxxxxxx>
m:<sip:0-d03365c213c46d247564@xxxxxxxxxxx:5060;transport=udp>
i:bf52f59d069087948090769a8a98fcdd-469d50d7@xxxxxxx
CSeq:21796 INVITE
User-Agent: Asterisk PBX
Max-Forwards:16
Date: Tue, 17 Jul 2007 23:29:27 GMT
Allow:INVITE,ACK,CANCEL,OPTIONS,BYE,REFER,SUBSCRIBE,NOTIFY
c:application/sdp
l:289
Remote-Party-ID: <sip:+$fU@$tU>;privacy=off;screen=no
P-Asserted-Identity: <sip:19998887777@xxxxxxx:5060>

.

Follow-Ups:
- Re: Regex insertion
  - From: Jens Thoms Toerring

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