PPTP_CALL_ASSERT
PPTP_CALL_ASSERT(_this != NULL);
PPTP_CALL_ASSERT(_this != NULL);
PPTP_CALL_ASSERT(pkt != NULL);
PPTP_CALL_ASSERT(lpkt >= 4);
PPTP_CALL_ASSERT(lpkt >= sizeof(struct pptp_ccr));
PPTP_CALL_ASSERT(_this != NULL);
PPTP_CALL_ASSERT(_this->state == PPTP_CALL_STATE_ESTABLISHED);
PPTP_CALL_ASSERT(ALIGNED_POINTER(opkt, uint32_t));
PPTP_CALL_ASSERT(_this != NULL);
PPTP_CALL_ASSERT(ppp != NULL);
PPTP_CALL_ASSERT(ppp->phy_context != NULL);
PPTP_CALL_ASSERT(_this->ppp == NULL);
PPTP_CALL_ASSERT(sizeof(ppp->phy_info) >= _this->ctrl->peer.ss_len);