<!-- Kamailio Project uses GitHub Issues only for bugs in the code or feature requests. Please use this template only for feature requests.

If you have questions about using Kamailio or related to its configuration file, ask on sr-users mailing list:

* http://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

If you have questions about developing extensions to Kamailio or its existing C code, ask on sr-dev mailing list:

* http://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev

Please try to fill this template as much as possible for any issue. It helps the developers to troubleshoot the issue.

If you submit a feature request (or enhancement) add the description of what you would like to be added.

If there is no content to be filled in a section, the entire section can be removed.

You can delete the comments from the template sections when filling.

You can delete next line and everything above before submitting (it is a comment). -->

### Description Right now, kamailio did not generate the heartbeat events a call. It's very important to have heartbeat event in kamailio so billing solution can be built independent of kamailio.

Heartbeat module can be built separately with having following parameters: modparam("heartbeat","duration",30) // this will describe at what pace heartbeat will get generated for every call. modparam("heartbeat","signature",caller=$dlg_var(caller);callee=$dlg_var(callee);account_id=$dlg_var(account_id)) -- this will tell what data to send. <!-- Explain what you did, what you expected to happen, and what actually happened. -->

### Expected behavior

#### Actual observed behavior

#### Debugging Data

``` (paste your debugging data here) ```

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your log messages here) ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your sip traffic here) ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a improvement. -->

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.1.4 (x86_64/linux) a1df59 flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: a1df59 compiled on 06:23:23 Oct 30 2018 with gcc 4.8.4 ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` root@ip-172-31-4-160:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.5 LTS Release: 14.04 Codename: trusty

root@ip-172-31-4-160:~# uname -a Linux ip-172-31-4-160 3.13.0-143-generic #192-Ubuntu SMP Tue Feb 27 10:45:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux ```