if ( $old and $new->forward_svcnum ne $old->forward_svcnum ) {
my $old_svc_acct = $self->acct_for_did($old);
$self->replace_subscriber( $old_svc_acct ) if $old_svc_acct;
if ( $old and $new->forward_svcnum ne $old->forward_svcnum ) {
my $old_svc_acct = $self->acct_for_did($old);
$self->replace_subscriber( $old_svc_acct ) if $old_svc_acct;