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The server is undergoing maintenance or is temporarily overloaded and so cannot process the request. A "Retry-After" header field may specify when the client may reattempt its request. [1]: §21.5.4 504 Server Time-out The server attempted to access another server in attempting to process the request, and did not receive a prompt response.
The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."
If the template has a separate documentation page (usually called "Template:template name/doc"), add [[Category:Time and date maintenance templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Time and date maintenance templates]]</noinclude>
Sim-card is put into GSM-gateways (or SIM-bank connected to GSM-gateway) in order to register it with the GSM network, at the same time the gateway is associated with VoIP through program switch. Accordingly, the traffic can be converted in and out between GSM and VoIP channels. SIP and H.323 protocols are used for media traffic termination.
The AOL Help site is your starting point for getting support from AOL. Support may come via phone, chat, social media or help articles, depending on the question or issue you have.
The Hayes command set includes commands for various phone-line operations such as dialing and hanging-up. It also includes various controls to set up the modem, including a set of register commands which allowed the user to directly set the various memory locations in the original Hayes modem.
VoIP users can change their Caller ID if they have admin rights on the VoIP server. Anyone who resells VoIP or manages their own VoIP server can allocate any phone number as an outgoing number. This is commonly used for genuinue reasons when a customer is porting a number, so they can use their number of a new plaform while the port takes place.
Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.