Thanks Henning
Sure I will double increase memory used by Kamailio

Could you check "shmem_real_used_size" for last 3 weeks
image.png

Half of this memory used by TLS module
Module: tls { ksr_tls_fix_domain(1057): 2496 tls_new_domain(187): 896 tls_new_cfg(1553): 48 tls_ct_wq_init(49): 8 mod_init(375): 8 mod_init(359): 8 ser_realloc(299): 6434632 ser_malloc(293): 43314912 Total: 49753008 }
Here is graph of "tcp_current_opened_connections" metrics

image.png

Amount of TCP and TLS connections is the same but used memory grows and for one TCP conection used about 
49753008 / 70 = 710757 bytes per one connections.

I think 700kb of memory for one TLS connections to much.

What you think?