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Knowledge Base > Accessories > I/O Expansion Cards > 2 Line VoIP Interface Card

Which call managers will the Symetrix VoIP card work with?

The Symetrix VoIP card must be used with a SIP based proxy server.

Which PBX does the Symetrix VoIP card support?

Our products utilize SIP 2.0 to interconnect with VoIP servers. We found that while SIP is a standard, there are many variances in the way it is applied by VoIP providers. SIP 2.0 is a loose specification that allows the developers of SIP-based systems to make many decisions on features and functions. The consequence of this is that two SIP based systems can be completely SIP 2.0 compliant and completely incompatible.

We have gone to great lengths to optimize our solutions for market-leading providers. Symetrix’s VoIP Interface Card has been tested for interoperability with Cisco, Avaya, 3CX and Asterisk and we intend to continue to test interoperability with other systems.

Much of the setup and configuration of a VoIP system is out of Symetrix’s and the AV integrator’s control. This includes the configuration and components of the VoIP network. We will make every effort to support the configuration of our VoIP Interface Card but if there are issues with the VoIP Interface Card not functioning with systems for which we have not created a configuration tech note, we can provide guidance but troubleshooting will need to be done with the assistance of the enterprise IT department or telephony system provider and interoperability cannot be guaranteed. We are unable to assist with the configuration of VoIP PBX systems.

How many calls can be handled by a single VoIP card?

The Symetrix VoIP card has 2 lines per card. 4 call appearances per VoIP card (4 remote calls, 2 call appearances per line).

Which Codecs are supported by the Symetrix VoIP card?

G.722, G.711 (A-law and μ-Law), G.729 (including Annex B) and G.723.1. Note that G.729 Annex B is currently supported for received audio only, the full implementation of VAD for all codecs will be in a future release.

How can I determine the priority of the Codecs?

This is user configurable in the VoIP card’s web-based administration interface using a simple drag and drop method.

How many VoIP cards can be used in a Symetrix system?

Limited only by the hosting DSP hardware type and numbers used. A single Edge Frame can host up to 4 cards, while Radius AEC and Radius 12xEX can each host a single card.

Do I need a PoE switch for the Symetrix VoIP card?

No, the Symetrix VoIP card doesn’t require a PoE switch as it is powered from the DSP unit it is installed into. If a PoE switch is used, it will not damage the Symetrix VoIP card.

How do you define the extension number or subscriber number?

First the IT department needs to establish the extension number. Then it is entered in the VoIP card’s web-based administration interface.

Will the VoIP card work with DHCP and can it be assigned a static IP?

Yes, the VoIP card is set to DHCP by default. It can easily be assigned to a static IP if needed from Composer software.

Does the VoIP card support IPv6?

No, only IPv4 is supported at this time.

Can the VoIP card be set to auto-answer?

Yes. In addition a setting of 1-8 rings before auto-answer can be selected.

Where can you see the MAC address?

The MAC address can be found in Composer software and on the Web admin.

Is it correct to say the Symetrix VoIP card acts as an end-point?

Yes, the Symetrix VoIP card works the same as any other VoIP phone on the network.

Is each line considered a separate instance with its own IP and extension?

The Symetrix VoIP card has 2 lines, with 2 call appearances per line. Each line gets its own extension. Only 1 IP address is assigned per card.

Can each line be set to use different Codecs?

The Codec settings are assigned for each card, so the same settings apply to both lines on a card.

Can the lines be assigned different Qos (Quality of Service) levels?

The same settings apply to both lines per card. 802.1Q User Priority can be set from 0-7, as well as DSCP settings for Audio RTP and Call Control.

Can different VLANS be used on each line?

VLANS can be used but only one VLAN can be used per card, which applies to both lines because there is only 1 IP per card.

How do you dial out from the Symetrix VoIP card?

Dialing can be done from Composer software, as well as many other methods. Third party devices such as AMX or Crestron can be used for dialing via Ethernet (UDP and TCP-IP) or RS-232.  SymVue software can also be used for dialing.

Can the 2 lines on a VoIP card be bridged together for a conference? Can lines from multiple cards be bridged together for a conference?

Yes, all lines connected to the system via multiple Symetrix VoIP cards can be combined. Each line must first be registered, but the combining of the lines is done within Composer software with mixing and routing.

Will the CISCO settings cause any confusion with the VoIP cards?

CISCO or other third party device manufacturers have no control of the Symetrix VoIP cards. Therefore the settings will have no bearing on Symetrix VoIP cards performance.