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What to do if MOS LQK scores decrease significantly on my Cisco IP Phone?
Significant decreases in MOS LQK scores may indicate network impairment due to packet loss and high jitter levels. An average decrease may point to widespread impairment, while individual decreases may indicate bursty impairment. Cross-check the conceal ratio and conceal seconds for evidence of packet loss and jitter.
What to do if Conceal Ratio is near zero, but voice quality is poor on Cisco IP Phone?
If the Conceal Ratio is near or at zero, but the voice quality of your Cisco IP Phone is poor, this may be due to noise or distortion in the audio channel, such as echo or audio levels. It could also be caused by tandem calls that undergo multiple encode/decode processes, like calls to a cellular network. Acoustic problems from a speakerphone, handsfree cellular phone, or wireless headset may also be the cause. Check packet transmit (TxCnt) and packet receive (RxCnt) counters to verify that voice packets are flowing.
Why are MOS LQK scores increasing significantly on my Cisco IP Phone?
If the MOS LQK scores increase significantly on your Cisco IP Phone, check if the phone is using a different codec than expected (RxType and TxType). Also, check to see if the MOS LQK version changed after a firmware upgrade.
Why do Conceal Ratio and Conceal Seconds increase significantly on Cisco IP Phone?
If the Conceal Ratio and Conceal Seconds increase significantly on your Cisco IP Phone, this is due to network impairment from packet loss or high jitter.
General| Control type | Buttons |
|---|---|
| Display type | LCD |
| Product type | IP conference phone |
| Voice codecs | G.711a, G.711u, G.722, G.729A, G.729ab, OPUS, iLBC |
| Certification | CE Markings per directives 2014/30/EU and 2014/53/EU and 2014/35/EU \u2028 \u2028 UL 60950 Second Edition \u2028 CAN/CSA-C22.2 No. 60950 Second Edition \u2028 EN 60950 Second Edition (including A11 and A12) IEC 60950 Second Edition (including A11 and A12) EN 60950-1 IEC 60950-1 AS/NZS 60950.1 47CFR Part 15 (CFR 47) Class B AS/NZS CISPR32 Class B \u2028 CISPR32 \u2028Class B EN55032 \u2028 Class B EN 300 386 ICES003 Class B \u2028 VCCI Class B \u2028 EN61000-3-2 \u2028 EN61000-3-3 \u2028 EN61000-4-2 IEC61000-4-2 EN61000-4-3 IEC61000-4-3 EN61000-4-6 IEC61000-4-6 KN22 Class B \u2028 EN55024 \u2028 CISPR24 \u2028 KN24 Armadillo Light AS/ACIF S004 NZPTC220 |
| Product color | Charcoal |
| Frequency range | 100 - 20000 Hz |
| Built-in display | Yes |
| Display diagonal | 3.9 \ |
| Languages support | ARA, BUL, CAT, CHI (SIMPL), CHI (TR), CZE, DAN, DEU, DUT, ENG, ESP, EST, FIN, FRE, GRE, HEB, HUN, ITA, JPN, KOR, LAT, LIT, NOR, POL, POR, RUM, RUS, SER, SLK, SLV, SWE, TUR, UKR |
| Display resolution | 480 x 128 pixels |
| Security algorithms | EAP-FAST, EAP-TLS, SHA-256, SSH |
| Ethernet LAN data rates | 10, 100 Mbit/s |
| Ethernet interface type | Fast Ethernet |
| Supported network protocols | IPv4, IPv6, SIP, SDP, UDP, DHCP, GARP, TFTP, HTTPS, RTP, RTCP, Cisco Discovery Protocol, LLDP |
| Cables included | USB |
| Storage temperature (T-T) | -10 - 60 °C |
| Operating temperature (T-T) | 0 - 40 °C |
| Storage relative humidity (H-H) | 10 - 95 % |
| Operating relative humidity (H-H) | 10 - 90 % |
| USB connector type | USB Type-C |
| RJ-45 ports quantity | 1 |
Weight and Dimensions| Width | 278 mm |
|---|---|
| Height | 61 mm |
| Weight | 1850 g |
Provides an overview of the phone's high-definition audio and 360-degree coverage capabilities.
Covers initial setup, network connection, and onboarding procedures using activation codes.
Describes physical buttons, screen layout, navigation controls, and softkey functions.
Covers call placement, answering, declining, silencing, and forwarding calls.
Explains transferring calls, setting up conference calls, and recording active calls.
Describes IM&P contacts, managing presence status, and basic call center operations.
Explains adding, editing, searching, and removing contacts from the personal address book.
Covers searching across various directories like LDAP, XML, Webex, and BroadSoft.
Explains how to access and view recent calls and call logs.
Covers setting up personal voicemail numbers and accessing messages.
Covers ringtones, DND, screen savers, wallpaper, time, date, language, password, and profile accounts.
Covers call blocking, waiting, secure calls, and HTTP proxy configuration.
Directs users to online resources for End User License Agreement and regulatory compliance.
Covers power outages, regulatory domains, health-care, external devices, and network congestion.
Lists compliance statements for various regions and details RF exposure and radio device regulations.
