Help: no sound on Obi202 with GV

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jpotkay:
Yes, I tried a different cordless phone plugged into the Obi and had the same issue. I could call and receive calls, but couldn't hear audio. The person on the other end could hear me though.

Thanks again!

jpotkay:
I contacted TP-Link support and they replied with directions on how to update my firmware to a previous version that had SIP ALG settings (see email and directions below; note that this is for an TP-Link Archer C9 v1). Unfortunately, turning off SIP ALG did not fix the problem. If anyone has any other ideas, I'd greatly appreciate it. Thanks again. -Joe

Email from TP-Link support:
---
Dear Joe,
Thank you very much for requesting information about our product.

I am sorry to tell you that your current firmware version doesn't has the SIP ALG switch in the interface.

We have another version of firmware Archer C9(UN)_V1_160517 which added the options for SIP ALG function, if you are willing to, please upgrade to this version.

1. To upgrade the C9 from a US version firmware to the UN version, please firstly flash your router to the firmware in below.
http://support.tp-link.com/f/886c69e5d6/

2. Then download the Archer C9(UN)_V1_160517 from https://www.tp-link.com/en/download/Archer-C9_V1.html#Firmware and do the firmware update again.

Instruction for firmware update https://www.tp-link.com/us/faq-1065.html
Note: Please connect your PC to the router via cable to do the firmware update, Do NOT update the firmware via wireless connection.

Thank you.

jpotkay:
Update for any that may read this later: TP-Link now suggested to try disabling NAT Boost, but the issue persists.

SteveInWA:
Buy.a.new.router.

azrobert:
You can try installing DD-WRT firmware.

Go here:
https://dd-wrt.com/support/router-database

Search for: archer c9
Select Revision 1.x
Follow instructions in Wiki, but download fw from database
I would do a reset before flashing
Wait a few minutes after flashing is complete before doing anything
You have the option to go back to factory fw

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