Hi, In a scenario where a person is running two gatekeepers . Is the call id guaranteed to be unique between gatekeepers. For eg: 2003/06/17 20:05:52.636 1 RasTbl.cxx(1549) CDR|1|02 13 5d 3f a6 01 b2 04 56 34 34 34 34 ef 00 00|13|Tue, 17 Jun 2003 20:05:39 +0530|Tue, 17 Jun 2003 20:05:52 +0530|202.68.135.220:1720|9807_endp|209.170.94.124:1720|9802_endp|151526112132132303:dialedDigits|yoda:h323_ID=00502d002559:h323_ID|TrkGK4; Is it guaranteed that the call id "02 13 5d 3f a6 01 b2 04 56 34 34 34 34 ef 00 00" to be generated by both the gatekeepers guaranteed to be unique. In case I 'm not clear.. In database terminology can I use it as a primary key. Thanks in advance.