[Asterisk-Users] SIP and IAX login design

[Webn1]

Hi !

I would like to know how to choose SIP & IAX login for customer account.

We will provide them DID, the good idea will be to said, login=phone number.
But in fact not, since a user can get call from different DID and may change
one day is phone number.
Also some user may not have a DID but a SIP account only.

Voicepulse seems use 10 caracters like xz78e6sd4z. What do you think is the
best solution ?
If you provide voip services what did you choose ?

Thanks !

Best Regards,

-- 
Fabien