[SR-Users] do we need high available IP for S-CSCF?

Hi all, Maybe I need a small hint. I have got a configuration of 2 S-CSCF instances (both kamailio 4.4.5 with S-CSCF configuration, each on a separate virtual machine) in load sharing mode (50:50). Both instances work on the same "scscf" data base, so that it is only one S-CSCF from a logical point of view. Now I get into troubles with registration: * P-CSCF sends REGISTER to first S-CSCF * First S-CSCF answers with 401 Unauthorized an challenges the UE. So far everything OK. * Second REGISTER is sent to second S-CSCF (DNS SRV Load Balancing). * Second S-CSCF answers again with 401 Unauthorized (Error) * This goes back and forth until UE gives up to register This problem exists sporadically (approx. every fifth registration). Now the question: is it worth to debug this configuration or should we rather switch to high available IP configuration (if we want to use kamailio)? What's your opinion/experiences? Thanks Christoph The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.