Hi TE, thanks for getting back to me.
mattybrownuk,
It looks as though the user you are acting as is not a valid user.
Could be - I actually don't have any "employees" created in the Hosted Voice portal. Since these are trunks for use by any extensions that attempt to make a phone call, they're not specific to any one employee, so I don't even understand why I have that option in their portal.
If I had to guess the phone number being used is not one provided by the SIP Carrier, but one provided by your ISDN30 Carrier; 441912345789.
The real phone number in this capture is one from the SIP carrier, not the ISDN30 - they gave us 10 temporary DDI numbers to test with. I've swapped out the number in this packet capture for a fake number formatted like a real one, so there's no identifiable info.
I am not familiar with how the Numbering Plan works in the UK, but is this a valid phone number; 07123456789? The other issue you may is if they require E.164 as you are not sending calls out using that.
Yes, numbers with the format 07xxxxxxxxx are valid UK mobile numbers. I'm wondering whether the SIP provider is expecting the leading 0 to be 44 (UK country code), like 447xxxxxxxxx. I've no idea where to change that to try it.
The configuration guide says "Use ITU-T E.164 Phone Number: If set to Yes, the MiVo250 handles ITU-T E.164 formatted phone numbers as part of the incoming SIP INVITE messages from the SIP peer.
Set this to NO for WHC.", so no, they don't require E.164.