Problem with 5th account

[njkmoore]

Hi

I've got a Yealink W52P with one base and five handsets. It all works fine with four handsets and four accounts, but then I enable the fifth account (in the web interface), everything goes haywire, with calls being dropped erratically, extensions not recognised and so forth.

The only solution I have is to leave the fifth account disabled, but that leaves me unable to use my fifth handset.

Any suggestions?

Thanks

Nick

Base 25.40.23.3
Handsets 26.30.0.29
Connecting to a Draytek 2820 IP PBX