Looks like I'm going to be spending a bunch of time in Indonesia in the near future helping set up a business.
Back home in Aus I currently run an uber small sole trader business that requires me to be able to answer and make phone calls pretty much 24/7. Right now I have an old landline that I ported to VoIP currently sitting in SIPTalk and just forwarding all calls to my mobile which is prepaid with Kogan, current prepay running out mid April, no international roaming/pack at the moment.
All of the international roaming options with Aus plans I've seen seem to be pretty expensive to use in this situation so I'm trying to figure out the best way around it.
I'm going to get an Indonesian SIM if only for local calls and internet while I'm there. Probably with Telkomsel because that seems to be the most consistent provider over there.
I need advice on the best method of handling receiving calls to my Kogan mobile and SIPTalk VoIP numbers and making calls to Aussie mobiles and landlines while in Indonesia. I'm fine with switching providers for everything if it gets a better deal. Advice on the Indonesia SIM/plan also welcome.
I haven't used VoIP much, but it sounds like you basically have a VoIP number that is used for calling in and out by your business. The number exists online, not connected to any device. You have set it up to forward to a particular mobile phone number that is not the business number, and you are wondering how to take this mobile number overseas?
I may have misunderstood, but this seems silly. The online number can be accessed from anywhere in the world, that's one of the benefits of VoIP. Forwarding to a mobile number might be convenient, but you could use the business number directly from any device that can run VoIP software and has internet access, such as a laptop, or even a mobile phone with internet access. You could just set up your phone to log in to SIPTalk directly, and then you wouldn't need to do anything but pop in an Indonesian data sim.
If you ALSO need the kogan number to work, that's probably much harder. A simple backup plan could simply be to set up a voicemail asking people to dial the other number. Maybe you could try to port this number to SIPTalk or another VoIP?