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T21P E2 Downgrade Firmware & PJSIP
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Jensen_Yealink Offline
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RE: T21P E2 Downgrade Firmware & PJSIP
(02-09-2018 07:46 AM)OSPFs Wrote:  We have bought two T21P E2 phones with firmware version 52.80.14.3 and when I configure it to work with Asterisk 13, I have found a bug with PJSIP driver. In some conditions we have one-way audio issue with PJSIP, as described here:

http://forum.yealink.com/forum/showthread.php?tid=8330

Then I upgraded one phone to latest firmware 52.82.0.20, but it is not helped me. Furthermore, a new firmware is worse then previous:
Titles on soft keys with russian language are not readeble
LDAP phonebook crashes sometime
And so on

So I have two questions:
Can I downgrade my phone to firmware 52.80.14.3 ?
And is there firmware without PJSIP problem?

Hello OSPFs,

Could you sent the PCAP, config.bin and syslog with level 6 to as, so we can check if it is the same to previous.
http://support.yealink.com/faq/faqInfo?id=707

On the other hands, I would like to share more about the Codec Negotiation.:
1/ The phone sent invite with all Codec enable on the phone to server side.
2/ The server side sent 200OK back with Codec that the server side would like the phone to used.
3/ The phone choose the Codec that server side feedback.

For the firmware you used, it is for Russia area.

BR
Jensen
02-10-2018 10:00 AM
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Messages In This Thread
T21P E2 Downgrade Firmware & PJSIP - OSPFs - 02-09-2018, 07:46 AM
RE: T21P E2 Downgrade Firmware & PJSIP - Jensen_Yealink - 02-10-2018 10:00 AM

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