These are my findings
2000 - 10/s(1 try)

/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save_pending"); #GEORGI                 2250
/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save"); #GEORGI                         1124
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI Not REGISTERED save pre_reg_sar_reply\n");    0
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI save reg_sar_replay\n");                      1124

2000 - 10/s(2 try)

/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save_pending"); #GEORGI                 2250
/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save"); #GEORGI                         1125
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI Not REGISTERED save pre_reg_sar_reply\n");    0
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI save reg_sar_replay\n");                      1125

2000 - 100/s (1 try)

/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save_pending"); #GEORGI                 323
/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save"); #GEORGI                         160
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI Not REGISTERED save pre_reg_sar_reply\n");    0
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI save reg_sar_replay\n");                      160

2000 - 100/s (2 try)

/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save_pending"); #GEORGI                 323
/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save"); #GEORGI                         160
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI Not REGISTERED save pre_reg_sar_reply\n");    0
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI save reg_sar_replay\n");                      160


2000 - 500/s (1 try)

/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save_pending"); #GEORGI                 379
/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save"); #GEORGI                         114
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI Not REGISTERED save pre_reg_sar_reply\n");    120
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI save reg_sar_replay\n");                      0

2000 - 500/s (2 try)

/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save_pending"); #GEORGI                 349
/usr/local/etc/kamailio/pcscf/route/register.cfg:               xlog("L_ERR", "GEORGI pcscf_save"); #GEORGI                         114
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI Not REGISTERED save pre_reg_sar_reply\n");    0
/usr/local/etc/kamailio/scscf/kamailio.cfg:                     xlog("L_ERR", "GEORGI save reg_sar_replay\n");                      153