[SR-Users] sip-router config file syntax question

I'm migrating from an older version of SER to sip-router. A syntax check of my config file produces a few errors. The most confusing is : 0(27980) WARNING: <core> [cfg.y:3364]: warning in config file /home/blairs/ser-penn.cfg, line 1270, column 22-23: non constant rvalue in ip comparison Line 1270 is the following if statement: if (to_ip==$g.gw_ip && !isflagset(FLAG_PSTN_ALLOWED) && !isflagset(FLAG_TOTAG) && method != "ACK" && method != "CANCEL") I do not see anything mentioned in config_migration.txt which explains this warning. Does anyone have any thoughts on how to correct this error? Thanks,steve