This advice is not valid for android / iphones though. You need the register to be able to have good battery life on those.>If you have no NAT or dynamic IP in your network, you can just remove the registration process and assign to each peer its IP address.This is the answer. If 100% availability is critical, your IP addresses shouldn't be changing anyway, so take the registration process out entirely.
If you use TCP, the softphone will go to sleep, OS will keep the stream alive. When a SIP packet comes in (INVITE, OPTIONS etc), the OS will wake up the softphone and the softphone will handle the packet.
No register means no stream and the softphone will just sleep forever. Z
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