[Serusers] routing question

Hello: I have some Cisco phones registered to SER running on FreeBSD 4.7. Users of these phones want to dial a telephone number and have the call correctly routed out to the PSTN via a Cisco gateway on the network. The users of course only key-in a telephone number. No domain name or IP address. I thought the following code would correctly append the IP address and port of the gateway to their telephone number so the call could get routed correctly. This is not working. Instead either the IP address of the calling phone or the domain name for my domain is appended. Any thought on how to correct this would be appreciated. # check if it's about PSTN destinations through our gateway; if (uri=~"sip:9{10}") { route(4); break; }; route[4] ..... some account statements followed by ..... rewritehostport("ip-address-of-pstn-gateway:5060"); Thanks,Steve