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Vonage In another thread:
The technical issues have already been addressed
In another thread:
The technical issues have already been addressed by a number of different groups. Implementation of Voip E911 would require some enhancements, but most could be made to existing hardware through a firmware upgrade.
The address information would be added to the current DNS system using an existing record type or, in the future, by adding a new record type to DNS. Machines would have the option to learn about their physical address via their DHCP server. They can either accept or override that information.
This would alleviate consumers from having to set their own addresses, their ISP would hand them their address when they got an IP address. This can be done using the circuit ID (or equivalent) for fixed lines (DSL, CABLE, T1s) or by using the ALI information for dialup. Wireless ISPs would have to implement something similar to what was done for Wireless E911 using network based (triangulation) or device based (GPS) location.
Internal networks would propogate that information down to the machine level, possibly adding floor numbers or room numbers based on port connections, wireless router connection or triangulation.
Given the address, Voip servers would route a special emergency number to the correct call center. (One issue is whether that number should be universal, currently 911 in the US and I believe 112 in Europe and other numbers elsewhere).
Call centers would be required to submit their geographical responsibility to a single authoritative database which could be accessed by all carriers. It might also be possible to implement some type of wide area ARP like protocol, but this would not be the best mechanism.
Addresses would probably be in the form of both geographic coordinates and Street addresses when available, however GIS software does a fair job of translation and could be used where both forms are not available.
This plan requires:
1) Incorporation of emergency dialing standards into Voip carrier equipment
2) Development of a worldwide emergency call center database
3) Incorporation of location awareness into routers, modems, Voip phones (SW & HW) and adapters via DNS lookups or manual configuration*
4) Eventual incorporation of geographical awareness into ISP infrastructure*
5) Conversion of current call centers into Voip based call centers.
* In the short term location awareness be handled by implementing firmware routers or Voip customer equipment that allowed end customers to manually specify addresses.
Also for the short term phones and adapters could be either queried or proactively let customers know if they were unable to automatically determine their location, or if the location was approximated, to request them to configure the device manually.
Voip (specifically SIP) adds a ton of features to emergency calling that are useful. It can be tied into alarm and fire systems and send text messages. Users could annotate their location information with medical data or special information about the premises (access, dogs, etc). Calls can be transferred or conferenced easily. The infrastructure required for a call center is greatly reduced allowing backup call centers to be built quickly and cheaply. Additionally it would be possible to test the system without human intervention at the call center to assure the user that an emergency call would be directed correctly.
Privacy: Some people will undoubtedly be concerned about location information being connected to their IP address. Therefore it would be necessary for ISPs to selectively turn off this capability (unlisted number). It would then be the responsibility of the customer to maintain their own address information. Another possibility is that DNS access to this information be restricted to the computer for which it is applicable, however if this were done it would be better not to use DNS as the repository.
Read The Full Thread: How VOIP E911 might work
• However many/most ISPs use dynamic IP address assignments for their residential
• No, the plan I outlined accounts for both DHCP and NAT. When an ISP assigns a dynamic
• Your treatise is good.
Not all PBX's are created equal. The Avaya Multivantage
scerruti posted "In another thread:
The technical issues have already been addressed" on 03/02/2005 |
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