<!-- Kamailio Pull Request Template -->

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#### Pre-Submission Checklist <!-- Go over all points below, and after creating the PR, tick all the checkboxes that apply --> <!-- All points should be verified, otherwise, read the CONTRIBUTING guidelines from above--> <!-- If you're unsure about any of these, don't hesitate to ask on sr-dev mailing list --> - [x] Commit message has the format required by CONTRIBUTING guide - [x] Commits are split per component (core, individual modules, libs, utils, ...) - [x] Each component has a single commit (if not, squash them into one commit) - [x] No commits to README files for modules (changes must be done to docbook files in `doc/` subfolder, the README file is autogenerated)

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#### Description <!-- Describe your changes in detail --> According to RFC 3261 & 3262 CANCEL , PRACK and BYE requests and their associated responses (most of them) must not have contact header You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3148

-- Commit Summary --

* Enable tm dns failover to try next ip on receiving code other than 503 * updates from master * Merge branch 'kamailio-master' * topos: remove contact header for CANCEL,BYE,PRACK REQUESTS

-- File Changes --

M src/modules/topos/tps_msg.c (7)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3148.patch https://github.com/kamailio/kamailio/pull/3148.diff