Hi Brad,
Does your phone reset? Typically, a phone resets if it has problems connecting to the access point and LAN or to Cisco Unified Communications Manager. What status msg are you getting on your phone's screen display?
Check this out : https://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7925g_7925gEX_7926/8_0/english/administration/guide/7925trb.pdf
1- Check wireless connectivity(wireless reception) first. I believe you are having network packet losses to your SIP server through wireless which causes call distortion,packet drops.
1- Check Layer-1 connectivity first. It sounds like your phone has network packet losses. Is it connected wireless? or PoE-ethernet? If wireless, please check the wireless reception at phone's location. And utilization on your Wireless AP. For optimum voice tranmission, RTT should be under 150 msec(actually this may go up to 200-250 msec, but Cisco recommends for better 2-way communication, RTT should be under 150msec.). Try to test wireless connection(check ping traversal timeto VoIP Signaling Server) with a laptop at the same location with phone-on desk. If PoE-ethernet, check your Layer 1 interface stats, do you see any increment on interface error stats?
If so, replace cable, check port settings(100,full),.
0 runts, 0 giants, 0 throttles
32432 input errors, 12354 CRC, 0 frame, 0 overrun, 0 ignored
2- Do you have QoS setup throughout your Network which prioritize VoiP(SIP and RTP) in front of scavenger(PC untrusted internet,etc.) traffic? If so, check end to end QoS setup(should be identical on each Backbone-core-Access PoE switches)if you receive any dropped packets?
SC-3750X-Stack#sh mls qos interface gigabitEthernet 1/0/43 statistics
GigabitEthernet1/0/43 (All statistics are in packets)
dscp: incoming
-------------------------------
0 - 4 : 100396 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 438625
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 26
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 199308863 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
-------------------------------
0 - 4 : 434937527 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 2050229 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 401913
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 42508 0 0 0 0
45 - 49 : 0 187241996 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
-------------------------------
0 - 4 : 205874224 0 0 0 0
5 - 7 : 0 0 0
cos: outgoing
-------------------------------
0 - 4 : 435306714 2050229 0 401913 0
5 - 7 : 187284504 0 336073
output queues enqueued:
queue: threshold1 threshold2 threshold3
-----------------------------------------------
queue 0: 2 0 187287533
queue 1: 434636617 23771515 336075
queue 2: 0 0 400855
queue 3: 0 2050229 754
output queues dropped:
queue: threshold1 threshold2 threshold3
-----------------------------------------------
queue 0: 0 0 0
queue 1: 0 0 0
queue 2: 0 0 0
queue 3: 0 0 0
Policer: Inprofile: 0 OutofProfile: 0
Please rate if it helps..
Thanks,
Allen
