Hi There
Thanks so much for your report and here is the advice to you :
1. Check if the base and handset are the same format, for RT20 , it can only worked for Europe Base which you can see CE icon at the back of the base.
For RT20U , we have two format, Europe and US , Europe can work with CE base and US can work with US base , you can check Europe or US base and repeater at the back of the device , CE is for Europe , FCC is for US.
Please make sure format can match.
2. Hard reset the base and test again ,the steps are below:
1) connect the network cable to the base without power supply or POE
2) long press the paging key on the base and not stop until step3 is finished
3) connect the power to base , waiting for the three lights on the base light up one by one , during the whole process, please keep pressing the paging key !
4) after the three lights all light up, release the paging key and disconnect and reconnect the power supply
Note : Once the base is reset , then all information that you have configured before will be cleared , so if you don't know how to register an SIP account or configure the phone , then please kindly connect your phone provider for help .
3. After step 1 and 2, refer to the FAQ :
http://support.yealink.com/faq/faqInfo?id=701
If still not work , please provide pcap file , bin file and level 6 log file for me so that I can double check .
For how to get them and check they are useful, please refer to the FAQ below:
http://support.yealink.com/faq/faqInfo?id=311
Please send us the trace file ASAP so that your issue can be solved faster !
Let me know if any question
TKS & BR
Michael
Yealink Wiki :
http://support.yealink.com/