We currently are working with a customer with an SPA122 voip, which uses udp 5060-5085, we typically place behind router. Beside setting HI-Priorty 128 in SM/QOS , placing ATA in bridge mode and placing behind router/private ip, are there any recommendation or must haves to flags option that would preferable in SM? We would have this issue with VOIP registration / flapped every 10mins then becomes stable, cannot understand why. We’ll be doing a wire shark packet capture at the AP/switch to determine the issues.
Any thoughts? 