* @param resp response to take authentication values from, might be NULL
* @param from_uri optional - an uri to use instead of the from of the request, which can be anonymous.
* @param auth_infos optional - A newly allocated belle_sip_auth_info_t object is added to this list. These object contains useful information like realm and username.
* @param realm optional - If an outbound proxy realm is used, nounce can be reused from previous request to avoid re-authentication.
* For transactions over unreliable transports, stop retransmissions. This avoids for example to keep sending INVITE retransmissions of a call that has just been terminated, while
* keeping the transaction alive in order to eventually let a response being handled, so that the transaction can be cancelled properly.