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| Chapter 31 Product Specifications | |
| Table 185 Voice Features | ||
| Multiple SIP | You can simultaneously use multiple voice (SIP) accounts and assign them to |
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| Accounts | one or both telephone ports. |
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| Multiple Voice | Your device can simultaneously handle multiple voice channels (telephone |
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| Channels | calls). Additionally you can answer an incoming phone call on a VoIP account, |
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| even while someone else is using the account for a phone call. |
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| Voice Activity | Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not |
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| Detection/Silence | transmitting when you are not speaking. |
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| Suppression |
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| Comfort Noise | Your device generates background noise to fill moments of silence when the |
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| Generation | other device in a call stops transmitting because the other party is not speaking |
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| (as total silence could easily be mistaken for a lost connection). |
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| Echo Cancellation | You device supports G.168, an |
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| by the sound of your voice reverberating in the telephone receiver while you |
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| talk. |
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| QoS (Quality of | Quality of Service (QoS) mechanisms help to provide better service on a per- |
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| Service) | flow basis. Your device supports Type of Service (ToS) tagging and |
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| Differentiated Services (DiffServ) tagging. This allows the device to tag voice |
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| frames so they can be prioritized over the network. |
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| MSNs | You can use MSNs (Multiple Subscriber Numbers) to identify individual ISDN |
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| phone connected to the ZyXEL Device for internal calls. Configure MSNs in the |
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| ZyXEL Device allow analog phones to use MSN features in ISDN calls. |
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| SIP ALG | Your device is a SIP Application Layer Gateway (ALG). It allows VoIP calls to |
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| pass through NAT for devices behind it (such as a |
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| application on a computer). |
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| Other Voice | SIP version 2 (Session Initiating Protocol RFC 3261) |
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| Features | SDP (Session Description Protocol RFC 2327) |
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| RTP (RFC 1889) |
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| RTCP (RFC 1890) |
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| Voice codecs (coder/decoders) G.711, G.726, G.729 |
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| Fax and data modem discrimination |
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| DTMF Detection and Generation |
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| DTMF: |
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| Quick dialing through predefined phone book, which maps the phone dialing |
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| number and destination URL. |
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| Flexible Dial Plan (RFC3525 section 7.1.14) |
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31.4 Wireless Features (Wireless Devices Only)
Table 186 Wireless Features
IEEE 802.11g+ Wireless LAN | Your device supports IEEE 802.11g+ to allow any ZyXEL WLAN |
| devices that also support IEEE 802.1g+ to associate with the ZyXEL |
| Device at higher transmission speeds than with standard IEEE |
| 802.11g. |
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External Antenna | The ZyXEL Device is equipped with an attached antenna to provide a |
| clear radio signal between the wireless stations and the access |
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Wireless LAN MAC Address | Your device can check the MAC addresses of wireless stations |
Filtering | against a list of allowed or denied MAC addresses. |
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| 429 |
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