Use CSipSimple instead of ObiTalk ObiOn App on Android

Android app for ObiTalk - ObiOn stopped working some time back so here is my solution for using CSipSimple instead.
It requires you to sign-up for a free IP Freedom account at Callcentric and a bit of setup.

1. Create an IP Freedom account 12341234567 at Callcentric here
2. Create a sub-account 12341234567101 (extension 101)
3. On your Android phone download and install CSipSimple from the Play Store
4. Add credentials for extension 101 from step 2 in CSipSimple setting
5. Login to your account on the ObiTalk Portal (https://www.obitalk.com/obinet/)
6. Setup SP2 (Callcentric) with the credentials from step 1 in the ObiTalk portal
7. Login to the management screen of your Obi on your  network using the IP Address
8. Under Voice Services > SP2 Service - set up this rule instead of the default:
   X_InboundCallRoute= {101>12341234567:aa},{ph}

That's it! To call into your Obi's AA, dial 100 (100 is the default extension for your main Callcentric account) from CSipSimple app on your phone.

Note that this is valid for Obi100 and Obi110 for sure but may also work for other Obi models.

And don't forget to replace the 12341234567 with the Callcentric number you receive after signing up!

Thanks to the multiple posters on the ObiTalk forums for all the above info that I have condensed into a set of simple easy to follow steps that work.