Most dial plans use an off-net trunk access code (i.e. 8 or 9 for local calls and 81 or 91 for long-distance calls) as part of the PSTN dialing patterns.
The Peeredge Switch SBC supports the following dial patterns:
Dial Pattern (called party) | Call Direction | Comment |
+1[2-9]XX[2-9]XXXXXX (e.164 format) | From Peeredge Switch SBC to Customer | 46 Labs recommends using e.164 format for all inbound calls |
1[2-9]XX[2-9]XXXXXX | From Peeredge Switch SBC to Customer | County Code (cc) and 10-digit NANP |
+[cc][subscriber number including area code] e.164 format | From Customer to Peeredge SwitchSBC | 46 Labs recommends using e.164 format for all outbound calls |
[cc][subscriber number including area code] e.164 format | From Customer to Peeredge SwitchSBC | Same as e.164 format without the leading + symbol |
911 988 | From Customer to Peeredge SwitchSBC |
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1[47]XX | From Customer to Peeredge SwitchSBC |
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0 | From Customer to Peeredge SwitchSBC | Operator services |
011! | From Customer to Peeredge SwitchSBC | International services |
ee.164 Dialing
The Peeredge Switches SBC fully support supports e.164 dialing. All PSTN carriers are configured for e.164 dialing.
E.164 is an international numbering plan for public telephone systems where each assigned number contains a country code, a national destination code, and a subscriber number. There can be up to 15 digits in an e.164 number. A complete e.164 number is designated by a leading + symbol. Two examples of e.164 numbers are +16054721233 and +4930220005020. When Peeredge Switches are is configured to support e.164 dialing , it alleviates the need to include an International Direct Dialing (IDD) prefix in the dialed number.
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When the trunk access code is set to 9 or 91, many customers have issues by mistakenly dialing 911 and then immediately hanging up after realizing their mistake. The 46 Labs Peeredge Switch SBC can complete a 911 call in a fraction of a second (much faster than a user can hang up the call). This forces the PSAP to attempt a callback to the number dialed or to dispatch local law enforcement to the registered location of the calling party number if the callback fails.
46 Labs recommends using e.164 dialing patterns.
Note: If an e.164 dial pattern is used, then all numbers in all relevant SIP headers (RURI, From, To, PAI, Contact, Diversion, etc.) in all inbound and outbound calls should be properly formatted as e.164 numbers.
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