channelvars=UNIQUEID,SOMETHINGELSE

WIP code for Asterisk 13 and FOP2 2.29 (wasn't tested thoroughly):

#. . .
sub __prep_chan {
	my $chan = shift(@_);
	
	$chan =~ s/^(.*)-.*/$1/;
	$chan = uc($chan);
	
	return $chan;
}

sub amiCommand {

	# Received an event from Asterisk Manager Interfase

	$command  = shift;

	if($command eq "DIALEND") {
		%event = @_;
		if($event{'DialStatus'} eq 'ANSWER') {
			my $dst_chan = __prep_chan($event{'DestChannel'});
			my $src_chan = __prep_chan($event{'Channel'});
			my $uid = $event{'Uniqueid'};
			
			my $return = "";
			my @allreturn = ();
			
			$return = "Action: UserEvent\r\n";
			$return .= "UserEvent: CustomPopup\r\n";
			$return .= "Uniqueid: $uid\r\n";
			$return .= "Channel: $dst_chan\r\n";
			$return .= "Family: notifyconnect\r\n";
			$return .= "Value: $src_chan\r\n";
			$return .= "\r\n";
			
			push @allreturn, $return;
			return @allreturn;
		}
	}

#. . .
}

My suggestion is to use the new plugin architecture to write such a modification. The .pl part of the plugin should contain something similar to this (that might vary depending on your Asterisk version, this sample is for Asterisk 11). You have to use a UserEvent to return a command to the client side (browser/extension), the command you want to send is the notifyconnect (or notifyringing). The event to intercept is "LINK" as fop2 will translate events to make it backwards compatible...

$AMI_Event_Handler{'bridgepopup'}{'LINK'} = sub {
    my $event = shift;
    my @allreturn;

    my $state = ${$event}{'Bridgestate'};
    $canal  = FOP2::utils::get_channel(${$event}{Channel1});
    $canal2 = FOP2::utils::get_channel(${$event}{Channel2});

    if($state eq "Link") {

        $return  = "Action: UserEvent\r\n";
        $return .= "UserEvent: CustomPopup\r\n";
        $return .= "Channel: $canal\r\n";
        $return .= "Family: notifyconnect\r\n";
        $return .= "Value: $canal2\r\n";
        $return .= "\r\n";
        push @allreturn, $return;

    }

    return @allreturn;
};

Look at the sampleplugin source to get an idea of how to use it. You install plugins using the FOP2 Manager.

http://download.fop2.com/plugins/sampleplugin-1.0.0.tgz

Best regards,