I just started using Cisco's SPA112 2 line analog adaptor. When I call a Polycom SIP phone on my network the call works correctly. When I call a Yealink SIP T-28P or T-22P I have audio issues. When I call from the Yealink phone to the ATA the call works correctly. When I call from the ATA to the Yealink I have no audio from the ATA, the Yealink transmits but can't hear the ATA. I can hear from the ATA but can't send to the Yealink. The Yealin works correctly to the Polycom phones and other Yealink phones. I suppect the issue is in the Yealink but I have no idea were to look. I tried a stare and compair to the Polycom including codecs but I can't find the issue. I am using a porta 1 SIP switch for registaration.
Article ID:1966 Network Address Translation (NAT) Settings for Lines on
PAP2T and SPA3102 Phone Adapters Objective The objective of this
document is to configure Network Address Translation (NAT) settings for
the lines of communication on the PAP2T and SP...
Article ID:2742 Speed Dial Settings on SPA100 Series Objective Speed
Dial Buttons are often used to make the process of calling regularly
used contacts quicker and with one button. This option is used in place
of dialing the entire phone number in. This h...
Article ID:2676 Firmware Upgrade on SPA112 and SPA122 Objective To
upgrade the firmware a specific file must be downloaded from the
Internet and uploaded to the device. Upgrading your devices can be very
useful. Firmware upgrades can fix software bugs, im...