diff --git a/include/osmocom/mgcp/mgcp.h b/include/osmocom/mgcp/mgcp.h
index 7597af8..5886a65 100644
--- a/include/osmocom/mgcp/mgcp.h
+++ b/include/osmocom/mgcp/mgcp.h
@@ -190,6 +190,7 @@
 	/* RTP patching */
 	int force_constant_ssrc; /* 0: don't, 1: once */
 	int force_aligned_timing;
+	bool rfc5993_hr_convert;
 
 	/* spec handling */
 	int force_realloc;
diff --git a/include/osmocom/mgcp/mgcp_internal.h b/include/osmocom/mgcp/mgcp_internal.h
index 14c5f11..a6239c2 100644
--- a/include/osmocom/mgcp/mgcp_internal.h
+++ b/include/osmocom/mgcp/mgcp_internal.h
@@ -128,6 +128,7 @@
 	int force_constant_ssrc; /* -1: always, 0: don't, 1: once */
 	/* should we perform align_rtp_timestamp_offset() (1) or not (0) */
 	int force_aligned_timing;
+	bool rfc5993_hr_convert;
 
 	/* Each end has a separate socket for RTP and RTCP */
 	struct osmo_fd rtp;
diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
index 2c86f8f..33738bc 100644
--- a/src/libosmo-mgcp/mgcp_network.c
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -43,6 +43,7 @@
 #include <osmocom/mgcp/mgcp_endp.h>
 #include <osmocom/mgcp/mgcp_codec.h>
 #include <osmocom/mgcp/debug.h>
+#include <osmocom/codec/codec.h>
 
 
 #define RTP_SEQ_MOD		(1 << 16)
@@ -651,6 +652,40 @@
 #endif
 }
 
+/* There are different dialects used to format and transfer voice data. When
+ * the receiving end expects GSM-HR data to be formated after RFC 5993, this
+ * function is used to convert between RFC 5993 and TS 101318, which we normally
+ * use. */
+static void rfc5993_hr_convert(struct mgcp_endpoint *endp, char *data, int *len)
+{
+	/* NOTE: *data has an overall length of RTP_BUF_SIZE, so there is
+	 * plenty of space available to store the slightly larger, converted
+	 * data */
+
+	struct rtp_hdr *rtp_hdr;
+
+	OSMO_ASSERT(*len >= sizeof(struct rtp_hdr));
+	rtp_hdr = (struct rtp_hdr *)data;
+
+	if (*len == GSM_HR_BYTES + sizeof(struct rtp_hdr)) {
+		/* TS 101318 encoding => RFC 5993 encoding */
+		memmove(rtp_hdr->data + 1, rtp_hdr->data, GSM_HR_BYTES);
+		rtp_hdr->data[0] = 0x00;
+		(*len) += 1;
+
+	} else if (*len == GSM_HR_BYTES + sizeof(struct rtp_hdr) + 1) {
+		/* RFC 5993 encoding => TS 101318 encoding */
+		memmove(rtp_hdr->data, rtp_hdr->data + 1, GSM_HR_BYTES);
+		(*len) -= 1;
+	} else {
+		/* It is possible that multiple payloads occur in one RTP
+		 * packet. This is not supported yet. */
+		LOGP(DRTP, LOGL_ERROR,
+		     "endpoint:0x%x cannot figure out how to convert RTP packet\n",
+		     ENDPOINT_NUMBER(endp));
+	}
+}
+
 /* Forward data to a debug tap. This is debug function that is intended for
  * debugging the voice traffic with tools like gstreamer */
 static void forward_data(int fd, struct mgcp_rtp_tap *tap, const char *buf,
@@ -758,6 +793,12 @@
 			if (addr)
 				mgcp_patch_and_count(endp, rtp_state, rtp_end,
 						     addr, buf, buflen);
+
+			if (rtp_end->rfc5993_hr_convert
+			    && strcmp(conn_src->end.codec->subtype_name,
+				      "GSM-HR-08") == 0)
+				rfc5993_hr_convert(endp, buf, &buflen);
+
 			LOGP(DRTP, LOGL_DEBUG,
 			     "endpoint:0x%x process/send to %s %s "
 			     "rtp_port:%u rtcp_port:%u\n",
diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c
index 9f95ea4..82db02f 100644
--- a/src/libosmo-mgcp/mgcp_protocol.c
+++ b/src/libosmo-mgcp/mgcp_protocol.c
@@ -652,6 +652,7 @@
 
 	rtp->force_aligned_timing = tcfg->force_aligned_timing;
 	rtp->force_constant_ssrc = patch_ssrc ? 1 : 0;
+	rtp->rfc5993_hr_convert = tcfg->rfc5993_hr_convert;
 
 	LOGP(DLMGCP, LOGL_DEBUG,
 	     "Configuring RTP endpoint: local port %d%s%s\n",
diff --git a/src/libosmo-mgcp/mgcp_vty.c b/src/libosmo-mgcp/mgcp_vty.c
index ef63b04..a47376b 100644
--- a/src/libosmo-mgcp/mgcp_vty.c
+++ b/src/libosmo-mgcp/mgcp_vty.c
@@ -37,6 +37,8 @@
 #define RTCP_OMIT_STR "Drop RTCP packets in both directions\n"
 #define RTP_PATCH_STR "Modify RTP packet header in both directions\n"
 #define RTP_KEEPALIVE_STR "Send dummy UDP packet to net RTP destination\n"
+#define RTP_TS101318_RFC5993_CONV_STR "Convert GSM-HR from TS101318 to RFC5993 and vice versa\n"
+
 
 static struct mgcp_config *g_cfg = NULL;
 
@@ -96,13 +98,17 @@
 	else
 		vty_out(vty, "  no rtcp-omit%s", VTY_NEWLINE);
 	if (g_cfg->trunk.force_constant_ssrc
-	    || g_cfg->trunk.force_aligned_timing) {
+	    || g_cfg->trunk.force_aligned_timing
+	    || g_cfg->trunk.rfc5993_hr_convert) {
 		vty_out(vty, "  %srtp-patch ssrc%s",
 			g_cfg->trunk.force_constant_ssrc ? "" : "no ",
 			VTY_NEWLINE);
 		vty_out(vty, "  %srtp-patch timestamp%s",
 			g_cfg->trunk.force_aligned_timing ? "" : "no ",
 			VTY_NEWLINE);
+		vty_out(vty, "  %srtp-patch rfc5993hr%s",
+			g_cfg->trunk.rfc5993_hr_convert ? "" : "no ",
+			VTY_NEWLINE);
 	} else
 		vty_out(vty, "  no rtp-patch%s", VTY_NEWLINE);
 	if (g_cfg->trunk.audio_payload != -1)
@@ -722,11 +728,28 @@
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_mgcp_patch_rtp_rfc5993hr,
+      cfg_mgcp_patch_rtp_rfc5993hr_cmd,
+      "rtp-patch rfc5993hr", RTP_PATCH_STR RTP_TS101318_RFC5993_CONV_STR)
+{
+	g_cfg->trunk.rfc5993_hr_convert = true;
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_no_patch_rtp_rfc5993hr,
+      cfg_mgcp_no_patch_rtp_rfc5993hr_cmd,
+      "no rtp-patch rfc5993hr", NO_STR RTP_PATCH_STR RTP_TS101318_RFC5993_CONV_STR)
+{
+	g_cfg->trunk.rfc5993_hr_convert = false;
+	return CMD_SUCCESS;
+}
+
 DEFUN(cfg_mgcp_no_patch_rtp,
       cfg_mgcp_no_patch_rtp_cmd, "no rtp-patch", NO_STR RTP_PATCH_STR)
 {
 	g_cfg->trunk.force_constant_ssrc = 0;
 	g_cfg->trunk.force_aligned_timing = 0;
+	g_cfg->trunk.rfc5993_hr_convert = false;
 	return CMD_SUCCESS;
 }
 
@@ -823,13 +846,17 @@
 			vty_out(vty, "  rtcp-omit%s", VTY_NEWLINE);
 		else
 			vty_out(vty, "  no rtcp-omit%s", VTY_NEWLINE);
-		if (trunk->force_constant_ssrc || trunk->force_aligned_timing) {
+		if (trunk->force_constant_ssrc || trunk->force_aligned_timing
+		    || g_cfg->trunk.rfc5993_hr_convert) {
 			vty_out(vty, "  %srtp-patch ssrc%s",
 				trunk->force_constant_ssrc ? "" : "no ",
 				VTY_NEWLINE);
 			vty_out(vty, "  %srtp-patch timestamp%s",
 				trunk->force_aligned_timing ? "" : "no ",
 				VTY_NEWLINE);
+			vty_out(vty, "  %srtp-patch rfc5993hr%s",
+				trunk->rfc5993_hr_convert ? "" : "no ",
+				VTY_NEWLINE);
 		} else
 			vty_out(vty, "  no rtp-patch%s", VTY_NEWLINE);
 		if (trunk->audio_fmtp_extra)
@@ -995,12 +1022,31 @@
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_trunk_patch_rtp_rfc5993hr,
+      cfg_trunk_patch_rtp_rfc5993hr_cmd,
+      "rtp-patch rfc5993hr", RTP_PATCH_STR RTP_TS101318_RFC5993_CONV_STR)
+{
+	struct mgcp_trunk_config *trunk = vty->index;
+	trunk->rfc5993_hr_convert = true;
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_trunk_no_patch_rtp_rfc5993hr,
+      cfg_trunk_no_patch_rtp_rfc5993hr_cmd,
+      "no rtp-patch rfc5993hr", NO_STR RTP_PATCH_STR RTP_TS101318_RFC5993_CONV_STR)
+{
+	struct mgcp_trunk_config *trunk = vty->index;
+	trunk->rfc5993_hr_convert = false;
+	return CMD_SUCCESS;
+}
+
 DEFUN(cfg_trunk_no_patch_rtp,
       cfg_trunk_no_patch_rtp_cmd, "no rtp-patch", NO_STR RTP_PATCH_STR)
 {
 	struct mgcp_trunk_config *trunk = vty->index;
 	trunk->force_constant_ssrc = 0;
 	trunk->force_aligned_timing = 0;
+	trunk->rfc5993_hr_convert = false;
 	return CMD_SUCCESS;
 }
 
@@ -1400,6 +1446,8 @@
 	install_element(MGCP_NODE, &cfg_mgcp_patch_rtp_ts_cmd);
 	install_element(MGCP_NODE, &cfg_mgcp_no_patch_rtp_ts_cmd);
 	install_element(MGCP_NODE, &cfg_mgcp_no_patch_rtp_cmd);
+	install_element(MGCP_NODE, &cfg_mgcp_patch_rtp_rfc5993hr_cmd);
+	install_element(MGCP_NODE, &cfg_mgcp_no_patch_rtp_rfc5993hr_cmd);
 	install_element(MGCP_NODE, &cfg_mgcp_sdp_fmtp_extra_cmd);
 	install_element(MGCP_NODE, &cfg_mgcp_sdp_payload_send_ptime_cmd);
 	install_element(MGCP_NODE, &cfg_mgcp_no_sdp_payload_send_ptime_cmd);
@@ -1431,6 +1479,8 @@
 	install_element(TRUNK_NODE, &cfg_trunk_patch_rtp_ssrc_cmd);
 	install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_ssrc_cmd);
 	install_element(TRUNK_NODE, &cfg_trunk_patch_rtp_ts_cmd);
+	install_element(TRUNK_NODE, &cfg_trunk_patch_rtp_rfc5993hr_cmd);
+	install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_rfc5993hr_cmd);
 	install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_ts_cmd);
 	install_element(TRUNK_NODE, &cfg_trunk_no_patch_rtp_cmd);
 	install_element(TRUNK_NODE, &cfg_trunk_sdp_fmtp_extra_cmd);