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I have several Yealink T26P phones, and when I log in to the phone via browser, and go to Network, Advacned tab, there is Voice QoS Settings available. I do know what the numbers mean for Voice QoS and SIP QoS. I have been unable to find any documentation to describe how to configure this. I am having call quality issues, and want to make sure this is configured right. I am using 3CX for PBX. Anybody played with this before?? Any help is appreciated!
Hi Jdhonse,
Actually this setting should work together with your network device setting, for example switch setting, and this value set depend on the switch setting.
It's follow RFC 791,
http://bogpeople.com/networking/dscp.shtml

1. BTW, what's the firmware of your T26P? The latest one 6.70.0.140?
http://www.yealink.com/Upload/firmware/T....0.140.zip
2. Did you try to reset to factory default?
3. There's only one phone have voice quality issue? Or all the IP phone have this issue? If yes, maybe it's network issue?
4. About voice quality issue, do you mean there's some delay of the voice, or intermittently?
Thanks.
(06-26-2013 11:08 AM)Yealink Support Wrote: [ -> ]Hi Jdhonse,
Actually this setting should work together with your network device setting, for example switch setting, and this value set depend on the switch setting.
It's follow RFC 791,
http://bogpeople.com/networking/dscp.shtml

1. BTW, what's the firmware of your T26P? The latest one 6.70.0.140?
http://www.yealink.com/Upload/firmware/T....0.140.zip
2. Did you try to reset to factory default?
3. There's only one phone have voice quality issue? Or all the IP phone have this issue? If yes, maybe it's network issue?
4. About voice quality issue, do you mean there's some delay of the voice, or intermittently?
Thanks.

My PBX is by 3CX, and they recommend firmware 6.70.0.103. If I change it, they will no longer support me. I have intermittent quality issues across the board. I currently have about 60 T26P's in use. I'm sorry, I don't understand the meaning of the link you sent me. How do the numbers in the QoS fields in the phone match up to the numbers on that page?
Any help is appreciated.
Hi Jdhonse,
OK got it.
Could you provide PCAP trace, syslog(level 6) and config.bin file to us, so we can analyze?
Before you export the syslog, please set log level as 6, and reboot the phone, then click Start,and reproduce the issue, then click Stop,and export the trace, syslog, config,bin to us.
(About where to export these files, please refer to attached screenshot.)
These three files are very important for us, hope you can kindly understand.

And you can send the email to support@yealink.com, because Forum have lower priority. Also make your config files more safe.
BTW, where are you from?
Thanks.
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