Address-Space.md
... ...
@@ -54,4 +54,22 @@ Specific policy restrictions:
54 54
| 172.23.16.0/21 | Closed to new allocations |
55 55
| 172.21.0.0/18<br/>172.21.128.0/17<br/>172.22.192.0/18 | Reserved for future use |
56 56
57
+# Telephony Numbering Space
57 58
59
+dn42 uses `+042` for telephony country code.
60
+
61
+The standard format is `+042-[N]-[XXXX]-ext`.
62
+
63
+> To maintain compatibility with SIP/PBX software and E.164 standards, the maximum total number length MUST NOT exceed 15 digits. Consequently, the extension part (ext) can only be between 0 and 7 digits long.
64
+
65
+| Prefix | Usage |
66
+|--------|-------|
67
+| +042-{0,1} | Reserved (for system or future administrative use) |
68
+| +042-2 | Open for customized prefix |
69
+| +042-4 | Open for AS424242XXXX MNT |
70
+| +042-{3,5-9} | Reserved |
71
+
72
+## Telephony Policies
73
+
74
+- An MNT SHOULD apply for only one telephony prefix unless there is sufficient justification provided.
75
+- E.164 numbers assigned by the ITU (traditional PSTN numbers) SHOULD NOT be entered into the registry at this time.
... ...
\ No newline at end of file