1. Multiple connectivity for analogue devices (ATA)
2. Failover to PSTN
3. IP-phone survivability in the event that the xDSL / IP route fails or when the ITSP / IP-PBX itself suffers an outage.
In fact a single Vega gateway can be depolyed to provide functionality for all of these three scenarios!
Read on for details of each of these:
1. High Density ATA
Multiple analogue device connectivity (phone, DECT cordless, fax, external loud bells) for UA endpoints operating with either a local SoftSwitch / IP-PBX deployed on the customer’s own network, or an off-site SoftSwitch / IP-Centrex application hosted by an ITSP.
Why wouldn't I just deploy IP Phones?The deployment of FXS phones & devices may be in conjunction with, or instead of IP phones, and indeed there are many areas where it is more practical to deploy a high density FXS gateway:
> Serves as an ideal legacy PBX replacement or where there is an absence of data/network cabling. The Vega simply replaces the telephone system’s central control unit & is connected to the existing telephone wiring & analogue phones
> Where there is a requirement for a large quantity of handsets & IP phones are inappropriate to deploy (public reception areas, business centres, tenement buildings, hotels, schools, nursing homes…)
> For long distance phone deployment (up to 8 kilometres line length)> Only a single LAN connection is required for the Vega thereby saving on costly switch/hub equipment & rack space requirements if multiple IP phones were otherwise deployed
> There is a single management interface and IP address on each Vega FXS gateway for all users connected, as opposed to having to separately manage lots of individual IP phones
How does it differ from an IP phone?
As far as the ITSP or IP-PBX is concerned there is no difference. Each FXS endpoint will behave in just the same way that an IP phone does; it will independently register with the SoftSwitch and will have its own telephone number, user account & password.
How do the connected phones work?
Vega gateways support telephony features which enable the FXS device to interoperate with the SoftSwitch & to use the advanced features which it provides:
> *Support of hook flash / TBR - for call hold & transfer - the R button on the phone!
> *CLIP to FXS telephone display - the user can observe who is calling before answering
> *MWI lamp indication or stuttered dial tone - for new voice mail message notification
> *Call waiting - the user can decide whether to hold, toggle or disconnect the existing call & answer the arriving call
> Three party conference
> Executive interrupt
> Call forward – unconditional, busy, no answer
> Do Not Disturb
> Hunt groups – linear up, round robin, random
> Call barring
> Hotline - a pre-determined number is called upon lifting the handset (visitor or door phone automatically calls the operator)
> Post fax voice call - after sending a fax the user can talk to the remote caller thereby saving money by not having to make a new call
> Distinctive ringing for called numbers (eg, sales, accounts) so that the user can answer the call appropriately
> Support of fax T.38 protocol. Also the ability to connect modem, PDQ etc
The Vega enables the advanced features of the SoftSwitch (call recording, voice mail etc) to be accessed just as an IP phone would do.
From the customer’s viewpoint it is arguable therefore that there is no discernable loss of features over an IP phone *provided that the analogue telephone is capable of supporting the above.
2. Lifeline PSTN Backup
All Vega variants equipped with FXS ports are also fitted with two FXO ports. When powered the Vega can route calls (999/112/911, local calls etc) to or from these two FXO ports. Under power failure conditions the two FXO ports provide a hard-wired bypass to the first two FXS ports allowing PSTN calls to be made even under this failure condition. Also in the event that the call cannot be routed via SIP to the IP-PBX/ITSP, it can be re-presented to the FXO thereby providing the customer with a back-up, resilient call routing during the outage.
click picture to enlarge
3. IP-phone Survivability
In the event that the IP-PBX or ITSP suffers an outage the IP-phones will cease to function & the customer's business is brought to a standstill. VegaStream has forseen that this is a potential weak point and possible barrier to take-up of service, & consequently has engineered unique a water-tight solution to overcome these issues:
Enhanced Network Proxy (ENP) (software option)
This option enables continuity of service during WAN/SIP outage & may be configured to operate in a number of ways including:
> Standalone proxy
> IP device survivability
> IP device call routing
> Emergency call routing
> SIP to SIP call routing
Simply put, the Vega is specified as the outboud proxy & therefore the IP-phones register through the Vega which in turn caches the registrations and forwards these to the IP-PBX/ITSP. When the route to the SoftSwitch is unavailable the Vega is aware of this & ensures that internal & external calls (via the PSTN) are staill able to occur. Vega is able to support up to 120 IP-phones.
Select the appropriate Vega Gateway
VegaStream manufactures a wide range of products to suit the quantity of analogue devices you need to connect. Simply select the gateway which provides the quantity of analogue FXS ports you require:
Vega 50 Europa
> 4 FXS + 2 FXO
> 24 FXS + 2 FXO
> 48 FXS + 2 FXO
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