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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.