Yes, here is the BT document.
at page 24: The digits may be interspersed with BT IA5-encoded punctuation characters “space” and “-"
http://www.sinet.bt.com/sinet/SINs/pdf/227v3p7.pdf
Follow on this post also;
Yes, here is the BT document.
at page 24: The digits may be interspersed with BT IA5-encoded punctuation characters “space” and “-"
http://www.sinet.bt.com/sinet/SINs/pdf/227v3p7.pdf
Follow on this post also;