[Serusers] PSTN gateway cluster - how to implement a backup procedure (maybe FAQ)

Hi, I'm sorry this is maybe a FAQ, but I can't configure SER in order to statefully forward all method for "PSTN uris" to a backup gateway only when the primary is not reachable or down; I have two gateways: - primary gateway (installed into a remote site, connected to 2 PRIs, IP connected via VPN) - backup gateway (installed locally, connected to a few BRIs) Is there a way to handle "gateway failover" directly into ser? If not possible, I could use DNS round robin, but I'd prefer to handle failover into SER. I've tried with t_on_failure but I can't insert any t_relay logic into onreply_route blocks: .... } else if ((uri=~"sip:0.*")||(uri=~"sip:3.*")) { route(2); } .... route[2] { t_on_failure("2"); prefix("99"); rewritehost("MY.PRIMARY.GW.IP"); t_relay_to_udp("MY.PRIMARY.GW.IP","5060"); } onreply_route[2] { xlog("L_ERR", "Can't connect to primary gateway, redirecting to backup one, uri was %ru"); revert_uri(); xlog("L_ERR", "Uri reverted back to %ru, forwarding to Cisco gw"); t_relay_to_udp("MY.BACKUP.GW.IP","5060"); # <----------- CAN'T DO THIS HERE!!! } Any ideas? Thanks! Pietro -- Ing. Pietro Ravasio - pietro.ravasio(a)abbeynet.it Enterprise Market Manager Abbeynet S.p.A. - http://www.abbeynet.it TEL: +390702109044 GSM: +393282172055 FAX: +390702109055