#### Pre-Submission Checklist - [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)

#### Type Of Change - [ ] Small bug fix (non-breaking change which fixes an issue) - [x] New feature (non-breaking change which adds new functionality) - [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist: <!-- Go over all points below, and after creating the PR, tick the checkboxes that apply --> - [ ] PR should be backported to stable branches - [x] Tested changes locally - [x] Related to issue #2348

#### Description

This PR allows excluding certain calls from CDRs in Kamailio route logic:

- adds a new modparam called _cdr_skip_ to **acc** module

- dialogs ended with chosen dlg_var set (no matter the value) won't generate a CDR even though _cdr_enable_ modparam is set.

- both database and log CDR will be prevented.

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/2351

-- Commit Summary --

* acc: new skip_cdr modparam to prevent cdr generation

-- File Changes --

M src/modules/acc/acc_cdr.c (10) M src/modules/acc/acc_mod.c (2) M src/modules/acc/acc_mod.h (1) M src/modules/acc/doc/acc_admin.xml (17)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2351.patch https://github.com/kamailio/kamailio/pull/2351.diff