PJSIP_MEDIA_OFFER: override configuration on refresh

When using the PSJIP_MEDIA_OFFER dialplan function it was not
overriding an endpoint's configured codecs on refresh unless
they had a shared codec between the two.

This patch makes it so whatever is set using PJSIP_MEDIA_OFFER
is used when creating the SDP for a refresh no matter what.

ASTERISK-28878 #close

Change-Id: I0f7dc86fd0fb607c308e6f98ede303c54d1eacb6

channels/pjsip/dialplan_functions.c

@@ -1363,6 +1363,7 @@ static int media_offer_write_av(void *obj)
 	ast_format_cap_remove_by_type(caps, data->media_type);
 	ast_format_cap_update_by_allow_disallow(caps, data->value, 1);
 	ast_stream_set_formats(stream, caps);
+	ast_stream_set_metadata(stream, "pjsip_session_refresh", "force");
 	ao2_ref(caps, -1);
 
 	return 0;

res/res_pjsip_session.c

@@ -1731,7 +1731,8 @@ static int sip_session_refresh(struct ast_sip_session *session,
 				}
 
 				/* Enforce the configured allowed codecs on audio and video streams */
-				if (ast_stream_get_type(stream) == AST_MEDIA_TYPE_AUDIO || ast_stream_get_type(stream) == AST_MEDIA_TYPE_VIDEO) {
+				if ((ast_stream_get_type(stream) == AST_MEDIA_TYPE_AUDIO || ast_stream_get_type(stream) == AST_MEDIA_TYPE_VIDEO) &&
+					!ast_stream_get_metadata(stream, "pjsip_session_refresh")) {
 					struct ast_format_cap *joint_cap;
 
 					joint_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);