We are seeing the same issue here with 183 replies not getting forwarded if theyu lack a Contact header. Is there a reason this is explicitly excluded from the 1xx replies:

if(msg->first_line.u.reply.statuscode>=100
					&& msg->first_line.u.reply.statuscode<200
					&& msg->first_line.u.reply.statuscode!=183) {
				/* provisional response with no mandatory contact header */
				return 0;
			}

Thanks

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