diff --git a/daemon/sdp.c b/daemon/sdp.c
index cba216af5..f2a7b15f6 100644
--- a/daemon/sdp.c
+++ b/daemon/sdp.c
@@ -2656,7 +2656,7 @@ int sdp_replace(struct sdp_chopper *chop, GQueue *sessions, struct call_monologu
 			insert_crypto(call_media, chop, flags);
 			insert_dtls(call_media, chop);
 
-			if (call_media->ptime)
+			if (proto_is_rtp(call_media->protocol) && call_media->ptime)
 				chopper_append_printf(chop, "a=ptime:%i\r\n", call_media->ptime);
 
 			if (MEDIA_ISSET(call_media, ICE) && call_media->ice_agent) {
diff --git a/t/auto-daemon-tests-reorder.pl b/t/auto-daemon-tests-reorder.pl
index e8fc65fe3..5c941c377 100755
--- a/t/auto-daemon-tests-reorder.pl
+++ b/t/auto-daemon-tests-reorder.pl
@@ -6956,7 +6956,6 @@ a=T38FaxMaxBuffer:200
 a=T38FaxMaxDatagram:180
 a=T38FaxUdpEC:t38UDPRedundancy
 a=sendrecv
-a=ptime:20
 SDP
 
 (undef, $port_a) = answer('gh 766 reinvite', {
@@ -6990,7 +6989,6 @@ a=T38FaxMaxBuffer:262
 a=T38FaxMaxDatagram:176
 a=T38FaxUdpEC:t38UDPRedundancy
 a=sendrecv
-a=ptime:20
 SDP
 
 snd($sock_b, $port_a, rtp(0, 4000, 5000, 0x4567, "\x88" x 160));
diff --git a/t/auto-daemon-tests.pl b/t/auto-daemon-tests.pl
index 781a4a883..5b0dd40b9 100755
--- a/t/auto-daemon-tests.pl
+++ b/t/auto-daemon-tests.pl
@@ -12372,7 +12372,6 @@ a=T38FaxMaxBuffer:200
 a=T38FaxMaxDatagram:180
 a=T38FaxUdpEC:t38UDPRedundancy
 a=sendrecv
-a=ptime:20
 SDP
 
 (undef, $port_a) = answer('gh 766 reinvite', {
@@ -12406,7 +12405,6 @@ a=T38FaxMaxBuffer:262
 a=T38FaxMaxDatagram:176
 a=T38FaxUdpEC:t38UDPRedundancy
 a=sendrecv
-a=ptime:20
 SDP
 
 snd($sock_b, $port_a, rtp(0, 4000, 5000, 0x4567, "\x88" x 160));