[sr-dev] Parse value from SIP message within custom module without affecting the SIP message

Hi guys! I am trying to parse Call-ID from received message within my custom kamailio module but every time I parse it and persist it within shared memory of my module the kamailio sends back (to UA) SIP message with `{Call-ID-hex-stream}0d` instead of `{Call-ID-hex-stream}00` So it seems that kamailio adds `CR` byte to Call-ID which I am parsing. This is how I am parsing and persisting the Call-ID (in my opinion it's without affecting the original message but yet it seems that I am wrong): First of all I parse Call-ID so I have `str` structure where the `call_id_str.s` is pointing to the begining of Call-ID within `sip_msg_t` structure and `call_id_str.len` has the length of that Call-ID. Secondly I am trying to copy the string from received SIP message into my own structure (I mean copy not just point to it since I need it also when the message is gone). I've prepared this function: int shm_copy_string(const char *original_string, int original_length, char **new_string) { // allocate shared memory for new string *new_string = (char *) shm_malloc(sizeof(char) * (original_length + 1)); if (*new_string == NULL) { ERR("cannot allocate shm memory"); return -1; } // copy original string to new string memcpy(new_string, &original_string, original_length); // end new string with null character (*new_string)[original_length] = '\0'; return 0; } I am calling this function within my module like this: shm_copy_string(call_id_str.s, call_id_str.len, &call_id); I don't manipulate with the pointer to original message in any way but still the message which kamailio sends back to my UA has that `CR` and it causes me big problems since UA cannot match the Call-ID. Also weird is that when I skip copying of the Call-ID on Registration message it is not affected so UA can register but then when I am trying to call from UA to UA I am getting as a response for my INVITE the `407 Proxy Authentication Required` with malformed Call-ID. Messages where I don't parse Call-ID are OK so the problem must be in this function. Has anyone came across this issue? How-come response SIP message is affected when I didn't add anything to the message? Thanks in advance for any help