Hi everyone, We're using a local 3CX server. We use Yealink T52s phones. We use Welltech ATA 172POE for our faxes and other analog lines. The Yealink phones have all codecs listed as available, and the Welltech has G711 and G729 and G723 listed. When I call from an ATA handset to a yealink handset, the ATA handset can HEAR the Yealink, but the Yealink can not hear the ATA. This is ONLY if I direct dial an internal extension. If I dial out and back in (full local DID) to get the call routed through the SIP trunk, then it works fine. Any clues as to why? We first thought our butt set was bad, so I brought my fluke in, then we discovered the work around.