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You do not specify which gateway type you use to send the messages but I assume you use the SMPP Gateway. I don't exactly know what you mean with PPTP, if this refers to 'Point-to-Point Tunneling Protocol' then it would not have an effect on the sender ID of the messages you send with Diafaan SMS Server.

First you can check if the 'ApprovedSourceAddressList' property in the advanced settings of the SMPP Gateway properties has any entries. For the test it is best to leave this property empty so that it allows all custom source addresses. You should also check if the 'Users can override the default source address' option in the 'SMPP server' tab page is selected.

Diafaan SMS Server will send the message with source address '0000' different than '"0000"', the first source address will be sent as a short code and the latter as an alphanumeric source address, because it contains characters. It is possible that the SMPP server you use does not accept a short code as source address. If that is the case then you can force the SMPP Gateway to send '0000' as an alphanumeric sender ID with the prefix '%5%0%' (TON 5, NPI 0). The full notation for the source address is then '%5%0%0000'.

If that does not help then it is possible that your SMPP server simply does not allow source address '0000', your SMPP service provider will be able to tell you if that is the case.

Regards, Henk