Hi Ralph, no system is one stand alone 3300, two 5312 with dect stands and ten 5610 handsets.
I can call everyway ok except sip (dect) to ip.
IP to IP ok
IP to analogue ok
IP to SIP fails as no transmission.
SIP to analogue ok
I have now tried two dect stands and two IP phones
I will keep trying, any idea's welcome.