You should test for the uri format with if(uri=~"sip:\+353[0-9]+@") and then use strip(4) and prefix("0"). Ramona Barry Flanagan wrote: >Hi, > >I need to rewrite the destination uri to replace "+353" with "0" before >passing it on to our PSTN gateway.. > >What is the cleanest way to do this? > >Thanks. > > >