diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.c b/src/mod/endpoints/mod_sofia/mod_sofia.c
index c323a386f8..e2fc5111ce 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.c
+++ b/src/mod/endpoints/mod_sofia/mod_sofia.c
@@ -789,7 +789,9 @@ static void set_local_sdp(private_object_t *tech_pvt, char *ip, uint32_t port, c
 	}
 	if (tech_pvt->cng_pt) {
 		snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "a=rtpmap:%d CN/%d\n", tech_pvt->cng_pt, rate);
-		tech_pvt->cng_pt = 0;
+		if (!tech_pvt->rm_encoding) {
+			tech_pvt->cng_pt = 0;
+		}
 	}
     if (ptime) {
         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "a=ptime:%d\n", ptime);