You mean, pick up the incoming call > Play some music or on hold message > start call hunting?

I don't think you can do this with callcentric (the caller's phone will ring (so they don't get charged) during the call hunting). So if GV limits you to 25 seconds this will send you back to using Anveo or Voip.ms.

But you can do this with Anveo and I'm pretty sure with Voip.ms too.

I think, if GV limits the call ring to 25 seconds (can't you just definitely forward the call by passing the call over without GV ringing it?), the best 2 options are:

1. Anveo > forward SMS out with Telbo for €0.02. (as per above post)
2. Anveo > forward SMS to 372xxxx@onesimcard.com for free (this is why I went with Onesimcard over the other +372)

Yes, it is comparable (both are VOIP apps), but MobileVOIP uses all of the betamax clones (you can use only betamx clones with it), and it has more options:

• it can send SMS (all of the betamax clones support SMS sending)
• call out with callback
• call out with local access number (it automatically calls the local landline access number to call out)
• call out with WIFI/3G
• you can switch the multiple Caller IDs you want to set your outgoing call to use
• betamax clones have the lowest rates on the market (if you are calling many different countries you will use several of the clones to get the best rates everywhere)

The callcentric app on the other hand is really a SIP application with callcentric (and there a many other similar SIP applications, also with a broader range of SIP support), with the advantage that it can also use the callcentric callback and receive your callcentric incoming calls.

Some more info as you are using betamax clones:

If you want to be billed by the second and have the choice of 100% call quality, the professional betamax clones (you can use them in the same way as the others, also with MobileVOIP):

• have 1 sec. billing
• support an unlimited number of simultaneous call channels
• have 3 quality route rates (grey - standard - premium), grey being the cheapest with lowest call quality or connection success rates, standard is usually always good, premium is comparable to the top telecoms.

Example:

VoiceTrading. Wholesale VoIP solutions

A-Z Voip telecom Termination worldwide


edit: this also answers the comment of one of the above posters who didn't want to sometimes risk some little degraded call quality (doesn't happen often, mostly sometimes when calling some "exotic" countries); (use the standard or premium routes for this).

An observation
 

It seems to me, one partial solution is to ask that people who want to talk with
you send you an SMS and say what time would be good time to call back?
Perhaps they can even include the topic and you can always reply that you
can 't [don't want to] get back to them.

Do you mean, by explaining this to some/your closest contacts and giving everyone else the local US number which goes to a voicemail that asks them to call you at or to send an SMS to +372... (or any other number)?

This way the people who don't want to call an expensive foreign number will know that they can send you an SMS?

Yes, this wouldn't be as transparent or convenient for the caller as forwarding the call, but it would save you the forwarding costs (as well as saving you the whole bamboola of setting up an efficient forwarding system :p) .

@ckh

Regarding this, Anveo supports Early Media (= the ring tone = audio that is played back before the call in answered = the caller is not charged for the call while he is hearing this media).

Early Media even supports key presses. So, for example with a call flow like the attached picture the ring tone is replaced. If the callers press 0 they will hear the song "remix". If they press 1 to 9 they will hear the song "original". And while doing this and hearing these songs they are not charged for the call (until you answer the phone).

This can also be a good way to playback a recorded voice message.

I want everyone to send SMS--no phone calls!

wouldnt it be easy to do this if you have a VoIP enabled PBX box at home (e.g AVM Fritz!Box which is basically the standard router here in germany from all telco providers)?
I have set parallel calling on my landline number - so calling my landline rings our normal phone and two cellphones. first pickup gets the call.
With this function i also forward my calls to our XXSim and ToggleMobile if needed and can pick my provider as i wish...

Yes, but this way you are depending on your home Internet connection.

Home connections are less reliable than the providers using datacenters, so when your router is offline or not reachable you calls won't go through.

Except callcentric which other voip providers with did numbers support sip uri forwarding?

Voip.ms supports SIP URI forwarding.