The phone(s) should ring at least twice before being answered, or the CLI and Name will not be displayed.
All "in-network" calls between TBB phone lines use the Primus TBB MGCP VoIP protocol and provide CallerID and Caller Name transparently.
However, incoming and outgoing calls from a TBB line to a PSTN number use different standards in various portions of the call path. Primus TBB uses a 3rd party "Softswitch/SS7 Gateway" which interconnects the VoIP call to the PSTN. This SoftSwitch is based on American Bellcore standards (which differ from the old Canadian Stentor one somewhat). Hence, calls to and from the USA usually show the Name and Number correctly. However, calls to/from Canadian telcos may or may show the CallerID as "unavailable" - or if it shows the Number, it may not show the Name.
•The CallerID (CLI) number is generally always shown on the phone CID (displays). Sometimes due to "standards" or other issues, the CLI may not be shown or appears as "unavailable".
In addition, for some customers, 10 digit numbers seem to display the correct information, while long distance numbers (11 digits--including the '1') do not.
In rare cases, the number is also not displayed and is shown as 'Unavailable' or replaced with a star '*'.
•NAME display is provided for some users on most calls, while other TBB subscribers rarely get any NAME display. This is probably because NAME display in Canada does not follow the same "standard" as in the USA. Given that Primus uses 3rd party equipment based on the US standard, they seem to have modified it to work with most Canadian telcos, but not all telcos, or all specific "interconnections".
In addition, although your phone may show 15 characters, TBB NAME display is limited to 14 characters. However, the Caller Log will show the full 15 character NAME.
Note that not all phones and faxmodems handle CallerID and NAME display correctly. It is not just a "switch" issue, but a "phone/modem software" (interpretation) issue also.
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Refer to »www.ainslie.org.uk/callerid/cli_faq.htm for more information (points 7 & 18).
There are a number of CallerID standards. Most people think that Canada uses Bellcore, just like the USA. It does--almost. For some reason, the former Stentor member companies use a non-standard implementation of MDMF. Bellcore uses DN Directory Number), usually the 10 digit number that includes the area code found in the phone book. Stentor uses DDN (Dialable Directory Number), a variable length number that is the number that must be dialed to call the other person back (ie local calls don't include area code, long distance includes the preceding '1'). Normal Bellcore MDMF identifies each part of a message with a Message Type Word parameter, and the DN is assigned Parameter Type 02. The Canadian Stentor switches assign DDN to 03. This is incredibly confusing for anything that only looks for the DN in 02.
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by Styvas 
last modified: 2007-05-28 14:52:56 |
