Hi all, I am re-sending this issue... We have installed Kamailio-5.0 in Debian-8, Configured P, I & S-CSCF servers and running successfully... and we are able to make SIP calls(Video&Audio) successfully... Now we are trying to install on Ubuntu 16.04(Kamailio-5.0) and configured P-CSCF, I-CSCF and S-CSCF severs also... P-CSCF server working fine... While running I-CSCF and S-CSCF servers we are below error and exiting... Kindly advice. I-CSCF Error logs: root@ubuntu:/usr/local/src/kamailio# kamailio -f /usr/local/etc/icscf/kamailio.cfg loading modules under config path: /usr/local/lib64/kamailio/modu les/:/usr/local/src/kamailio/src/modules/ 0(19111) ERROR: <core> [core/sr_module.c:582]: load_module(): could not open module </usr/local/lib64/kamailio/modules/cdp.so>: /usr/local/lib64/kamailio/modules/cdp.so: undefined symbol: get_str_hash S_CSCF Error logs: root@ubuntu:/usr/local/etc/icscf# kamailio -f /usr/local/etc/scscf/kamailio. cfg loading modules under config path: /usr/local/lib64/kamailio/modules/ 0(19092) ERROR: <core> [core/sr_module.c:582]: load_module(): could not open module </usr/local/lib64/kamailio/modules/cdp.so>: /usr/local/lib64/kamailio/modules/cdp.so: undefined symbol: get_str_hash