Q.931 Called party number

Q.931 Channel Identification (ITU Q.931 section 4.5.8)

8	7	6	5	4	3	2	1	Octet
IE ID: 0x70								1
Length								2
ext. 1	Type of number			Number plan identification				3
0	Number digits (IA5 characters)							4 etc.

• Type of number
• Number plan identification
• Number digits：IA5 (International Alphabet No. 5) 字元也就是 ITU-T Recommendation T.50，也就是 ASCII。

參考

• E.164
• tel URI