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### Description
Enable dialog module to user choose between INVITE or OPTIONS on send Re-INVITE
on keep-alive
### Expected behavior
Make the dialog keep-alive through INVITE or OPTIONS. A user choice.
### Possible Solutions
In function dlg_send_ka of dlg_req_within.c:445, provide an option to choose
the value from module config var, pv value, dlg flag, etc.
```
File: dlg_req_within.c
435 /* send keep-alive
436 * dlg - pointer to a struct dlg_cell
437 * dir - direction: the request will be sent to:
438 * DLG_CALLER_LEG (0): caller
439 * DLG_CALLEE_LEG (1): callee
440 */
441 int dlg_send_ka(dlg_cell_t *dlg, int dir)
442 {
443 uac_req_t uac_r;
444 dlg_t* di;
445 str met = {"INVITE", 6};
446 int result;
447 dlg_iuid_t *iuid = NULL;
```
### Additional Information
Just for local tests, i changed dlg_req_within.c:445 from {"OPTIONS",7} to
{"INVITE",6} and worked like a charm. I don't know if this change will affect
other parts of kamailio.
Let me know if this change affect something else.
Thanks.
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