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diff --git a/pjsip/src/pjsip/sip_types.h b/pjsip/src/pjsip/sip_types.h
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+++ b/pjsip/src/pjsip/sip_types.h
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+/* $Header: /pjproject/pjsip/src/pjsip/sip_types.h 5     6/19/05 6:12p Bennylp $ */
+#ifndef __PJSIP_SIP_TYPES_H__
+#define __PJSIP_SIP_TYPES_H__
+
+#include <pjsip/sip_config.h>
+#include <pj/types.h>
+
+/**
+ * Opaque data structure for transports (sip_transport.h).
+ */
+typedef struct pjsip_transport_t pjsip_transport_t;
+
+/**
+ * Opaque data type for transport manager (sip_transport.h).
+ */
+typedef struct pjsip_transport_mgr pjsip_transport_mgr;
+
+/**
+ * Transport types.
+ */
+typedef enum pjsip_transport_type_e
+{
+    /** Unspecified. */
+    PJSIP_TRANSPORT_UNSPECIFIED,
+
+    /** UDP. */
+    PJSIP_TRANSPORT_UDP,
+
+#if PJ_HAS_TCP
+    /** TCP. */
+    PJSIP_TRANSPORT_TCP,
+
+    /** TLS. */
+    PJSIP_TRANSPORT_TLS,
+
+    /** SCTP. */
+    PJSIP_TRANSPORT_SCTP,
+#endif
+
+} pjsip_transport_type_e;
+
+
+/**
+ * Forward declaration for endpoint (sip_endpoint.h).
+ */
+typedef struct pjsip_endpoint pjsip_endpoint;
+
+/**
+ * Forward declaration for transactions (sip_transaction.h).
+ */
+typedef struct pjsip_transaction pjsip_transaction;
+
+/**
+ * Forward declaration for events (sip_event.h).
+ */
+typedef struct pjsip_event pjsip_event;
+
+/**
+ * Forward declaration for transmit data/buffer (sip_transport.h).
+ */
+typedef struct pjsip_tx_data pjsip_tx_data;
+
+/**
+ * Forward declaration for receive data/buffer (sip_transport.h).
+ */
+typedef struct pjsip_rx_data pjsip_rx_data;
+
+/**
+ * Forward declaration for message (sip_msg.h).
+ */
+typedef struct pjsip_msg pjsip_msg;
+
+/**
+ * Forward declaration for URI (sip_uri.h).
+ */
+typedef struct pjsip_uri pjsip_uri;
+
+/**
+ * Opaque data type for the resolver engine (sip_resolve.h).
+ */
+typedef struct pjsip_resolver_t pjsip_resolver_t;
+
+/**
+ * Forward declaration for credential.
+ */
+typedef struct pjsip_cred_info pjsip_cred_info;
+
+
+/**
+ * Forward declaration for module (sip_module.h).
+ */
+typedef struct pjsip_module pjsip_module;
+
+/**
+ * Transaction role.
+ */
+typedef enum pjsip_role_e
+{
+    PJSIP_ROLE_UAC,	/**< Transaction role is UAC. */
+    PJSIP_ROLE_UAS,	/**< Transaction role is UAS. */
+} pjsip_role_e;
+
+
+/**
+ * General purpose buffer.
+ */
+typedef struct pjsip_buffer
+{
+    /** The start of the buffer. */
+    char *start;
+
+    /** Pointer to current end of the buffer, which also indicates the position
+        of subsequent buffer write.
+     */
+    char *cur;
+
+    /** The absolute end of the buffer. */
+    char *end;
+
+} pjsip_buffer;
+
+
+/**
+ * General host:port pair, used for example as Via sent-by.
+ */
+typedef struct pjsip_host_port
+{
+    unsigned flag;	/**< Flags of pjsip_transport_flags_e (not used in Via). */
+    unsigned type;	/**< Transport type (pjsip_transport_type_e), or zero. */
+    pj_str_t host;	/**< Host part. */
+    int	     port;	/**< Port number. */
+} pjsip_host_port;
+
+
+#endif	/* __PJSIP_SIP_TYPES_H__ */
+