You support a customer whose Microsoft Lync Server 2013 environment includes a single Lync Server 2013 Standard Edition pool located in a main office and four branch offices that are connected by a…

You support a customer whose Microsoft Lync Server 2013 environment includes a single Lync Server 2013 Standard Edition pool located in a main office and four branch offices that are connected by a 3MB dedicated wide area network (WAN) link, with 100 users in each office. The Lync client's IP address is 10.0.0.100. The Lync IP server's address is 192.168.255.2. Quality of Service (QoS) is configured in Lync server for voice to use the differentiated service code point (DSCP) with a value of 46. Users in the branch offices report poor audio quality during conferences that are hosted on Lync. The results of a network trace include the following information:

Based on the network trace, you need to identify the most likely cause of the call quality issues. Which setting should you modify?