Hello Everyone, I was using openser for some time as a proxy registrar only with excellent results, now I need to do a more complex application.<br><br>The scenario is:<br>PSTN--DS3 Connection--CISCO AS5400 ----Openser<br><br>We have a Cisco AS5400 connected with a DS3 to the PSTN and need to terminate some traffic, however we need to block about 5,000 out of 120,000 possible destinations based in the first 6 digits of destination dialed.<br><br>For example, destination dialed is 13054941678. First, the leading 1 is removed, then if 305494 is in blacklist some message is sent back to sender (503 Service Unavailable). If 305494 is not in blacklist the call is routed to Cisco AS5400.<br><br>How do you think I can accomplish this without adding appreciable post-dial-delay and having 1 call per second?<br><br>Thank you for reading my post.<br>JP <br><p>&#32;