We currently use four-digit extension dial between two facilities which is connected with MPLS. Users have got break-up voice intermittently. Since ISP's connection between router to router is set up with QoS already. Therefore we have been thinking if the break-up/latency is caused by our own switches (HP V1810) since they the switches are not low-end products and cannot be properly set with QoS. My questions to you are:
1. Currently we don't have a separate VLAN for voice traffic. Do you think it is essential to set up a separate VLAN just for voice traffic in order to improve the voice quality?
2. Can you recommend a couple of models of switches good for QoS and VLAN please? Of course should not be too expensive; just better than what we have is okay.