+ if ($pcno == 50) {
+ last SWITCH;
+ }
+ if ($pcno == 51) { # incoming ping requests/answers
+
+ # is it for us?
+ if ($field[1] eq $main::mycall) {
+ my $flag = $field[3];
+ $flag ^= 1;
+ $self->send($self->pc51($field[2], $field[1], $flag));
+ } else {
+ # route down an appropriate thingy
+ $self->route($field[1], $line);
+ }
+ return;
+ }