diff --git a/tests/mgcp_client/mgcp_client_test.c b/tests/mgcp_client/mgcp_client_test.c
index 007b90c..9978f79 100644
--- a/tests/mgcp_client/mgcp_client_test.c
+++ b/tests/mgcp_client/mgcp_client_test.c
@@ -95,21 +95,26 @@
 
 void test_response_cb(struct mgcp_response *response, void *priv)
 {
+	unsigned int i;
 	OSMO_ASSERT(priv == mgcp);
 	mgcp_response_parse_params(response);
 
-	printf("response cb received:\n"
-	       "  head.response_code = %d\n"
-	       "  head.trans_id = %u\n"
-	       "  head.comment = %s\n"
-	       "  audio_port = %u\n"
-	       "  audio_ip = %s\n",
-	       response->head.response_code,
-	       response->head.trans_id,
-	       response->head.comment,
-	       response->audio_port,
-	       response->audio_ip
-	      );
+	printf("response cb received:\n");
+	printf("  head.response_code = %d\n", response->head.response_code);
+	printf("  head.trans_id = %u\n", response->head.trans_id);
+	printf("  head.comment = %s\n", response->head.comment);
+	printf("  audio_port = %u\n", response->audio_port);
+	printf("  audio_ip = %s\n", response->audio_ip);
+	printf("  ptime = %u\n", response->ptime);
+	printf("  codecs_len = %u\n", response->codecs_len);
+	for(i=0;i<response->codecs_len;i++)
+		printf("  codecs[%u] = %u\n", i, response->codecs[i]);
+	printf("  ptmap_len = %u\n", response->ptmap_len);
+	for(i=0;i<response->ptmap_len;i++) {
+		printf("  ptmap[%u].codec = %u\n", i, response->ptmap[i].codec);
+		printf("  ptmap[%u].pt = %u\n", i, response->ptmap[i].pt);		
+	}
+	
 }
 
 mgcp_trans_id_t dummy_mgcp_send(struct msgb *msg)
@@ -149,8 +154,9 @@
 		"s=-\r\n"
 		"c=IN IP4 10.9.1.120\r\n"
 		"t=0 0\r\n"
-		"m=audio 16002 RTP/AVP 98\r\n"
-		"a=rtpmap:98 AMR/8000\r\n"
+		"m=audio 16002 RTP/AVP 110 96\r\n"
+		"a=rtpmap:110 AMR/8000\r\n"
+		"a=rtpmap:96 GSM-EFR/8000\r\n"
 		"a=ptime:20\r\n");
 }
 
@@ -166,7 +172,15 @@
 		.audio_port = 1234,
 		.call_id = 47,
 		.conn_id = "11",
-		.conn_mode = MGCP_CONN_RECV_SEND
+		.conn_mode = MGCP_CONN_RECV_SEND,
+		.ptime = 20,
+		.codecs[0] = CODEC_GSM_8000_1,
+		.codecs[1] = CODEC_AMR_8000_1,
+		.codecs[2] = CODEC_GSMEFR_8000_1,
+		.codecs_len = 1,
+		.ptmap[0].codec = CODEC_GSMEFR_8000_1,
+		.ptmap[0].pt = 96,
+		.ptmap_len = 1
 	};
 
 	if (mgcp)
@@ -183,6 +197,26 @@
 	msg = mgcp_msg_gen(mgcp, &mgcp_msg);
 	printf("%s\n", (char *)msg->data);
 
+	printf("Generated CRCX message (two codecs):\n");
+	mgcp_msg.verb = MGCP_VERB_CRCX;
+	mgcp_msg.presence =
+	    (MGCP_MSG_PRESENCE_ENDPOINT | MGCP_MSG_PRESENCE_CALL_ID |
+	     MGCP_MSG_PRESENCE_CONN_ID | MGCP_MSG_PRESENCE_CONN_MODE);
+	mgcp_msg.codecs_len = 2;
+	msg = mgcp_msg_gen(mgcp, &mgcp_msg);
+	mgcp_msg.codecs_len = 1;	
+	printf("%s\n", (char *)msg->data);
+
+	printf("Generated CRCX message (three codecs, one with custom pt):\n");
+	mgcp_msg.verb = MGCP_VERB_CRCX;
+	mgcp_msg.presence =
+	    (MGCP_MSG_PRESENCE_ENDPOINT | MGCP_MSG_PRESENCE_CALL_ID |
+	     MGCP_MSG_PRESENCE_CONN_ID | MGCP_MSG_PRESENCE_CONN_MODE);
+	mgcp_msg.codecs_len = 3;
+	msg = mgcp_msg_gen(mgcp, &mgcp_msg);
+	mgcp_msg.codecs_len = 1;	
+	printf("%s\n", (char *)msg->data);		
+
 	printf("Generated MDCX message:\n");
 	mgcp_msg.verb = MGCP_VERB_MDCX;
 	mgcp_msg.presence =
@@ -192,6 +226,28 @@
 	msg = mgcp_msg_gen(mgcp, &mgcp_msg);
 	printf("%s\n", (char *)msg->data);
 
+	printf("Generated MDCX message (two codecs):\n");
+	mgcp_msg.verb = MGCP_VERB_MDCX;
+	mgcp_msg.presence =
+	    (MGCP_MSG_PRESENCE_ENDPOINT | MGCP_MSG_PRESENCE_CALL_ID |
+	     MGCP_MSG_PRESENCE_CONN_ID | MGCP_MSG_PRESENCE_CONN_MODE |
+	     MGCP_MSG_PRESENCE_AUDIO_IP | MGCP_MSG_PRESENCE_AUDIO_PORT);
+	mgcp_msg.codecs_len = 2;
+	msg = mgcp_msg_gen(mgcp, &mgcp_msg);
+	mgcp_msg.codecs_len = 1;	
+	printf("%s\n", (char *)msg->data);
+
+	printf("Generated MDCX message (three codecs, one with custom pt):\n");
+	mgcp_msg.verb = MGCP_VERB_MDCX;
+	mgcp_msg.presence =
+	    (MGCP_MSG_PRESENCE_ENDPOINT | MGCP_MSG_PRESENCE_CALL_ID |
+	     MGCP_MSG_PRESENCE_CONN_ID | MGCP_MSG_PRESENCE_CONN_MODE |
+	     MGCP_MSG_PRESENCE_AUDIO_IP | MGCP_MSG_PRESENCE_AUDIO_PORT);
+	mgcp_msg.codecs_len = 3;
+	msg = mgcp_msg_gen(mgcp, &mgcp_msg);
+	mgcp_msg.codecs_len = 1;	
+	printf("%s\n", (char *)msg->data);	
+
 	printf("Generated DLCX message:\n");
 	mgcp_msg.verb = MGCP_VERB_DLCX;
 	mgcp_msg.presence =
@@ -242,6 +298,9 @@
 		.conn_mode = MGCP_CONN_RECV_SEND,
 		.presence = (MGCP_MSG_PRESENCE_ENDPOINT | MGCP_MSG_PRESENCE_CALL_ID
 			     | MGCP_MSG_PRESENCE_CONN_ID | MGCP_MSG_PRESENCE_CONN_MODE),
+		.ptime = 20,
+		.codecs[0] = CODEC_AMR_8000_1,
+		.codecs_len = 1		
 	};
 
 	printf("\n%s():\n", __func__);
@@ -376,6 +435,99 @@
 	OSMO_ASSERT(!failures);
 }
 
+static void test_map_pt_to_codec(void)
+{
+	/* Full form */
+	OSMO_ASSERT(map_str_to_codec("PCMU/8000/1") == CODEC_PCMU_8000_1);
+	OSMO_ASSERT(map_str_to_codec("GSM/8000/1") == CODEC_GSM_8000_1);
+	OSMO_ASSERT(map_str_to_codec("PCMA/8000/1") == CODEC_PCMA_8000_1);
+	OSMO_ASSERT(map_str_to_codec("G729/8000/1") == CODEC_G729_8000_1);
+	OSMO_ASSERT(map_str_to_codec("GSM-EFR/8000/1") == CODEC_GSMEFR_8000_1);
+	OSMO_ASSERT(map_str_to_codec("GSM-HR-08/8000/1") == CODEC_GSMHR_8000_1);
+	OSMO_ASSERT(map_str_to_codec("AMR/8000/1") == CODEC_AMR_8000_1);
+	OSMO_ASSERT(map_str_to_codec("AMR-WB/16000/1") == CODEC_AMRWB_16000_1);
+
+	/* Short form */
+	OSMO_ASSERT(map_str_to_codec("GSM-EFR") == CODEC_GSMEFR_8000_1);
+	OSMO_ASSERT(map_str_to_codec("G729") == CODEC_G729_8000_1);
+	OSMO_ASSERT(map_str_to_codec("GSM-HR-08") == CODEC_GSMHR_8000_1);
+
+	/* We do not care about what is after the first delimiter */
+	OSMO_ASSERT(map_str_to_codec("AMR-WB/123///456") == CODEC_AMRWB_16000_1);
+	OSMO_ASSERT(map_str_to_codec("PCMA/asdf") == CODEC_PCMA_8000_1);
+	OSMO_ASSERT(map_str_to_codec("GSM/qwertz") == CODEC_GSM_8000_1);
+
+	/* A trailing delimiter should not hurt */
+	OSMO_ASSERT(map_str_to_codec("AMR/") == CODEC_AMR_8000_1);
+	OSMO_ASSERT(map_str_to_codec("G729/") == CODEC_G729_8000_1);
+	OSMO_ASSERT(map_str_to_codec("GSM/") == CODEC_GSM_8000_1);
+
+	/* This is expected to fail */
+	OSMO_ASSERT(map_str_to_codec("INVALID/1234/7") == -1);
+	OSMO_ASSERT(map_str_to_codec(NULL) == -1);
+	OSMO_ASSERT(map_str_to_codec("") == -1);
+	OSMO_ASSERT(map_str_to_codec("/////") == -1);
+
+	/* The buffers are 64 bytes long, check what happens with overlong
+	 * strings as input (This schould still work.) */
+	OSMO_ASSERT(map_str_to_codec("AMR-WB/16000/1############################################################################################################") == CODEC_AMRWB_16000_1);
+
+	/* This should not work, as there is no delimiter after the codec
+	 * name */
+	OSMO_ASSERT(map_str_to_codec("AMR-WB####################################################################################################################") == -1);
+}
+
+static void test_map_codec_to_pt_and_map_pt_to_codec(void)
+{
+	struct ptmap ptmap[10];
+	unsigned int ptmap_len;
+	unsigned int i;
+
+	ptmap[0].codec = CODEC_GSMEFR_8000_1;
+	ptmap[0].pt = 96;
+	ptmap[1].codec = CODEC_GSMHR_8000_1;
+	ptmap[1].pt = 97;
+	ptmap[2].codec = CODEC_AMR_8000_1;
+	ptmap[2].pt = 98;
+	ptmap[3].codec = CODEC_AMRWB_16000_1;
+	ptmap[3].pt = 99;
+	ptmap_len = 4;
+
+	/* Mappings that are covered by the table */
+	for (i = 0; i < ptmap_len; i++)
+		printf(" %u => %u\n", ptmap[i].codec, map_codec_to_pt(ptmap, ptmap_len, ptmap[i].codec));
+	for (i = 0; i < ptmap_len; i++)
+		printf(" %u <= %u\n", ptmap[i].pt, map_pt_to_codec(ptmap, ptmap_len, ptmap[i].pt));
+	printf("\n");
+
+	/* Map some codecs/payload types from the static range, result must
+	 * always be a 1:1 mapping */
+	printf(" %u => %u\n", CODEC_PCMU_8000_1, map_codec_to_pt(ptmap, ptmap_len, CODEC_PCMU_8000_1));
+	printf(" %u => %u\n", CODEC_GSM_8000_1, map_codec_to_pt(ptmap, ptmap_len, CODEC_GSM_8000_1));
+	printf(" %u => %u\n", CODEC_PCMA_8000_1, map_codec_to_pt(ptmap, ptmap_len, CODEC_PCMA_8000_1));
+	printf(" %u => %u\n", CODEC_G729_8000_1, map_codec_to_pt(ptmap, ptmap_len, CODEC_G729_8000_1));
+	printf(" %u <= %u\n", CODEC_PCMU_8000_1, map_pt_to_codec(ptmap, ptmap_len, CODEC_PCMU_8000_1));
+	printf(" %u <= %u\n", CODEC_GSM_8000_1, map_pt_to_codec(ptmap, ptmap_len, CODEC_GSM_8000_1));
+	printf(" %u <= %u\n", CODEC_PCMA_8000_1, map_pt_to_codec(ptmap, ptmap_len, CODEC_PCMA_8000_1));
+	printf(" %u <= %u\n", CODEC_G729_8000_1, map_pt_to_codec(ptmap, ptmap_len, CODEC_G729_8000_1));
+	printf("\n");
+
+	/* Try to do mappings from statically defined range to danymic range and vice versa. This
+	 * is illegal and should result into a 1:1 mapping */
+	ptmap[3].codec = CODEC_AMRWB_16000_1;
+	ptmap[3].pt = 2;
+	ptmap[4].codec = CODEC_PCMU_8000_1;
+	ptmap[4].pt = 100;
+	ptmap_len = 5;
+
+	/* Apply all mappings again, the illegal ones we defined should result into 1:1 mappings */
+	for (i = 0; i < ptmap_len; i++)
+		printf(" %u => %u\n", ptmap[i].codec, map_codec_to_pt(ptmap, ptmap_len, ptmap[i].codec));
+	for (i = 0; i < ptmap_len; i++)
+		printf(" %u <= %u\n", ptmap[i].pt, map_pt_to_codec(ptmap, ptmap_len, ptmap[i].pt));
+	printf("\n");
+}
+
 static const struct log_info_cat log_categories[] = {
 };
 
@@ -403,6 +555,8 @@
 	test_mgcp_msg();
 	test_mgcp_client_cancel();
 	test_sdp_section_start();
+	test_map_codec_to_pt_and_map_pt_to_codec();
+	test_map_pt_to_codec();
 
 	printf("Done\n");
 	fprintf(stderr, "Done\n");
diff --git a/tests/mgcp_client/mgcp_client_test.err b/tests/mgcp_client/mgcp_client_test.err
index 7309242..1d5a1a0 100644
--- a/tests/mgcp_client/mgcp_client_test.err
+++ b/tests/mgcp_client/mgcp_client_test.err
@@ -62,4 +62,8 @@
 body: "some mgcp header data\r\nand header params\n\r\rm=audio 23\r\n"
 DLMGCP MGCP response: cannot find start of SDP parameters
 got rc=-22
+DLMGCP ptmap contains illegal mapping: codec=113 maps to pt=2
+DLMGCP ptmap contains illegal mapping: codec=0 maps to pt=100
+DLMGCP ptmap contains illegal mapping: codec=113 maps to pt=2
+DLMGCP ptmap contains illegal mapping: codec=0 maps to pt=100
 Done
diff --git a/tests/mgcp_client/mgcp_client_test.ok b/tests/mgcp_client/mgcp_client_test.ok
index fc6db30..454ee3d 100644
--- a/tests/mgcp_client/mgcp_client_test.ok
+++ b/tests/mgcp_client/mgcp_client_test.ok
@@ -18,8 +18,9 @@
 s=-
 c=IN IP4 10.9.1.120
 t=0 0
-m=audio 16002 RTP/AVP 98
-a=rtpmap:98 AMR/8000
+m=audio 16002 RTP/AVP 110 96
+a=rtpmap:110 AMR/8000
+a=rtpmap:96 GSM-EFR/8000
 a=ptime:20
 
 -----
@@ -29,16 +30,39 @@
   head.comment = OK
   audio_port = 16002
   audio_ip = 10.9.1.120
+  ptime = 20
+  codecs_len = 2
+  codecs[0] = 112
+  codecs[1] = 110
+  ptmap_len = 2
+  ptmap[0].codec = 112
+  ptmap[0].pt = 110
+  ptmap[1].codec = 110
+  ptmap[1].pt = 96
 
 Generated CRCX message:
 CRCX 1 23@mgw MGCP 1.0
 C: 2f
 I: 11
-L: p:20, a:AMR, nt:IN
+L: p:20, a:GSM, nt:IN
+M: sendrecv
+
+Generated CRCX message (two codecs):
+CRCX 2 23@mgw MGCP 1.0
+C: 2f
+I: 11
+L: p:20, a:GSM;AMR, nt:IN
+M: sendrecv
+
+Generated CRCX message (three codecs, one with custom pt):
+CRCX 3 23@mgw MGCP 1.0
+C: 2f
+I: 11
+L: p:20, a:GSM;AMR;GSM-EFR, nt:IN
 M: sendrecv
 
 Generated MDCX message:
-MDCX 2 23@mgw MGCP 1.0
+MDCX 4 23@mgw MGCP 1.0
 C: 2f
 I: 11
 M: sendrecv
@@ -48,18 +72,50 @@
 s=-
 c=IN IP4 192.168.100.23
 t=0 0
-m=audio 1234 RTP/AVP 255
+m=audio 1234 RTP/AVP 3
+a=ptime:20
+
+Generated MDCX message (two codecs):
+MDCX 5 23@mgw MGCP 1.0
+C: 2f
+I: 11
+M: sendrecv
+
+v=0
+o=- 2f 23 IN IP4 127.0.0.1
+s=-
+c=IN IP4 192.168.100.23
+t=0 0
+m=audio 1234 RTP/AVP 3 112
+a=rtpmap:112 AMR/8000/1
+a=ptime:20
+
+Generated MDCX message (three codecs, one with custom pt):
+MDCX 6 23@mgw MGCP 1.0
+C: 2f
+I: 11
+M: sendrecv
+
+v=0
+o=- 2f 23 IN IP4 127.0.0.1
+s=-
+c=IN IP4 192.168.100.23
+t=0 0
+m=audio 1234 RTP/AVP 3 112 96
+a=rtpmap:112 AMR/8000/1
+a=rtpmap:96 GSM-EFR/8000/1
+a=ptime:20
 
 Generated DLCX message:
-DLCX 3 23@mgw MGCP 1.0
+DLCX 7 23@mgw MGCP 1.0
 C: 2f
 I: 11
 
 Generated AUEP message:
-AUEP 4 23@mgw MGCP 1.0
+AUEP 8 23@mgw MGCP 1.0
 
 Generated RSIP message:
-RSIP 5 23@mgw MGCP 1.0
+RSIP 9 23@mgw MGCP 1.0
 
 Overfolow test:
 
@@ -102,4 +158,33 @@
 test_sdp_section_start() test [8]:
 
 test_sdp_section_start() test [9]:
+ 110 => 96
+ 111 => 97
+ 112 => 98
+ 113 => 99
+ 96 <= 110
+ 97 <= 111
+ 98 <= 112
+ 99 <= 113
+
+ 0 => 0
+ 3 => 3
+ 8 => 8
+ 18 => 18
+ 0 <= 0
+ 3 <= 3
+ 8 <= 8
+ 18 <= 18
+
+ 110 => 96
+ 111 => 97
+ 112 => 98
+ 113 => 113
+ 0 => 0
+ 96 <= 110
+ 97 <= 111
+ 98 <= 112
+ 2 <= 2
+ 100 <= 100
+
 Done