diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 8a3580ba07..99e39f4da5 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -6876,6 +6876,11 @@ static int sip_answer(struct ast_channel *ast)
 	int res = 0;
 	struct sip_pvt *p = ast->tech_pvt;
 
+	if (!p) {
+		ast_debug(1, "Asked to answer channel %s without tech pvt; ignoring\n",
+				ast->name);
+		return res;
+	}
 	sip_pvt_lock(p);
 	if (ast->_state != AST_STATE_UP) {
 		try_suggested_sip_codec(p);	
@@ -7045,6 +7050,12 @@ static int sip_senddigit_begin(struct ast_channel *ast, char digit)
 	struct sip_pvt *p = ast->tech_pvt;
 	int res = 0;
 
+	if (!p) {
+		ast_debug(1, "Asked to begin DTMF digit on channel %s with no pvt; ignoring\n",
+				ast->name);
+		return res;
+	}
+
 	sip_pvt_lock(p);
 	switch (ast_test_flag(&p->flags[0], SIP_DTMF)) {
 	case SIP_DTMF_INBAND:
@@ -7069,6 +7080,12 @@ static int sip_senddigit_end(struct ast_channel *ast, char digit, unsigned int d
 	struct sip_pvt *p = ast->tech_pvt;
 	int res = 0;
 
+	if (!p) {
+		ast_debug(1, "Asked to end DTMF digit on channel %s with no pvt; ignoring\n",
+				ast->name);
+		return res;
+	}
+
 	sip_pvt_lock(p);
 	switch (ast_test_flag(&p->flags[0], SIP_DTMF)) {
 	case SIP_DTMF_INFO:
@@ -7094,6 +7111,12 @@ static int sip_transfer(struct ast_channel *ast, const char *dest)
 	struct sip_pvt *p = ast->tech_pvt;
 	int res;
 
+	if (!p) {
+		ast_debug(1, "Asked to transfer channel %s with no pvt; ignoring\n",
+				ast->name);
+		return -1;
+	}
+
 	if (dest == NULL)	/* functions below do not take a NULL */
 		dest = "";
 	sip_pvt_lock(p);
@@ -7242,6 +7265,12 @@ static int sip_indicate(struct ast_channel *ast, int condition, const void *data
 	struct sip_pvt *p = ast->tech_pvt;
 	int res = 0;
 
+	if (!p) {
+		ast_debug(1, "Asked to indicate condition on channel %s with no pvt; ignoring\n",
+				ast->name);
+		return res;
+	}
+
 	sip_pvt_lock(p);
 	switch(condition) {
 	case AST_CONTROL_RINGING: