Hi

If I omit the third parameter of the SendMsgWithUserContext method (From) I receive an SMS from an unknown number 07800000000....,. I can reply to this, which I assume would tie in with the UserContext I defined as the fourth parameter in the method signature.

If I supply the third parameter, "BillAndBen" say, I receive a message from an Alias (that is, it displays as from BillAndBen on my receiving device). I cannot reply to this message, as attempting to do so says "Address Unknown" on my device.

Is there a way to supply an alias that can be replied to?

I ask, as the message comes from a different number each time.

Thanks,
Andy

Hi Andy,

When you use the UserContext feature, our system uses different reply number to track different UserContext values. When you send a message to a mobile phone our system allocate a reply number for each UserContext value you supplied. When a reply is received back from a mobile phone our system determines the UserContext value based on the number the message was received on.

If you provide a sender's ID (or Originating Address) for your SMS message then it is not possible to reply to the message. This is a limitation of the GSM Network/Handset, it is not a limitation of our system.

I had assumed that that was the case, and wasn't implying the system was at fault merely testing my understanding.

Can you confirm that the UserContext I supply will be supplied back in an unaltered form when using HTTP forwarding of responses?

When using SendMsgWithUserContext, the method returns a string - which is a numeric value when no errors occur. What is the purpose of this string?

Thanks
Andy