diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 33ec7f06d9..7e11b2420f 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -7376,6 +7376,12 @@ static void try_suggested_sip_codec(struct sip_pvt *p)
 
 		ao2_ref(fmt, -1);
 	}
+
+	/* The original joint formats may have contained negotiated parameters (fmtp)
+	 * like the Opus Codec or iLBC 20. The cached formats contain the default
+	 * parameters, which could be different than the negotiated (joint) result. */
+	ast_format_cap_replace_from_cap(p->jointcaps, original_jointcaps, AST_MEDIA_TYPE_UNKNOWN);
+
 	ao2_ref(original_jointcaps, -1);
 	return;
  }