I would like to construct an enum query using more than one pseudo variable.  The result will be a non-e.164 string which is ok for this application.  

Ideally, it would be something like:

 enum_pv_query("$rU + $rp");


This would result in the username from the R-URI appended to the port of the R-URI.

However, this doen't seem to work and I wind up with 1.2.1.2.5.5.5.2.1.2.1.$rp.e164.arpa.

Instead of using the $rp pseudo variable, the string "$rp" is used to form the query.  It should be:

1.2.1.2.5.5.5.2.1.2.1.0.6.0.5.e164.arpa.

where the port 5060 is inserted between the R-URI username and the domain suffix.

Is there a different or better way to use the variables within enum_pv_query to construct a query?  

Thanks.