FS-8114 #resolve [Opus and telephone event payload types collide on REFER]

src/switch_core_media.c

@@ -7359,6 +7359,15 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 					smh->dtmf_ianacodes[i] = smh->mparams->te;
 					smh->cng_ianacodes[i] = smh->mparams->cng_pt;
 				} else {
+					int j = 0;
+
+					for (j = 0; j < smh->mparams->num_codecs; j++) {
+						if (smh->ianacodes[i] == smh->payload_space) {
+							smh->payload_space++;
+							break;
+						}
+					}
+
 					smh->dtmf_ianacodes[i] = (switch_payload_t)smh->payload_space++;
 					smh->cng_ianacodes[i] = (switch_payload_t)smh->payload_space++;
 				}