Release Summary for 4.2.20
  Changes to 4.2 after version 4.2.19
  * [Added block rule for PortSIP VoIP SDK user agents  (cherry picked from commit 6a27ddb19783c5a927c4a77e4ff212db8fcb64ce)](https://github.com/2600hz/kazoo-configs-kamailio/commit/efb26d6957c883c04baecf6335b6e4978d2707b0) by Sergey Safarov
  * [Add NAT_UAC_TEST as config option in local.cfg and defs.cfg](https://github.com/2600hz/kazoo-configs-kamailio/commit/aaa3b61180c42ea185a00b112fc7223bfe23176a) by Noah Mehl
  * [some fixes &amp; optimizations  * handle caller-id  * fix token-reg registration  * use reg_fetch_contacts  * set tm failure_exec_mode  * use IC_SIL](https://github.com/2600hz/kazoo-configs-kamailio/commit/77a302fce4fe7522ffa6c9a55576422ef2c61bb9) by lazedo
  * [accept token-reg from uri.params and tobody.params](https://github.com/2600hz/kazoo-configs-kamailio/commit/78e6a85f748e6efd1fab65ffacf946b16f9111af) by lazedo
  * [add PUSHER_ATTEMPT_REGISTRATION to registrar](https://github.com/2600hz/kazoo-configs-kamailio/commit/cfbeb214b3d01c05e4e720cbe55d25535581d176) by lazedo
 -- 2600Hz Official <packages@2600hz.com>  Fri, 27 Jul 2018 18:35:12 +0000
