| Caller ID Display (CLI) CLI Restriction | Call Hold |
| 3-Party Conference Call Transfer | Call Waiting |
| Do Not Disturb (DND) Distinctive Ring | Pick Up |
| Firewall Traversal Standard SIP Protocol TR069/SNMP/Web System Logs | Login Logs |
| QoS | VLAN |
Key Specifications & Features
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The DS Series datasheet (for FXS/FXO models) lists a “16 FXS” variant under the “DS 16FXS” model. dasscom.com+2dasscom.com+2
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Telephony interface: 16 FXS ports (for analogue phones/faxes) — i.e., you plug in 16 analogue devices, and gateway to SIP/VoIP. hubrisindia.in+2dasscom.com+2
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VoIP/SIP support:
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SIP 2.0 (RFC 3261) and other relevant SIP/IMS standards. dasscom.com
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Codecs: G.711 A/µ-law, G.729a/ab, G.723.1. dasscom.com
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Fax support: T.38 & bypass mode. dasscom.com
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DTMF modes: In-band, RFC 2833, SIP INFO. dasscom.com
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Network interface: 1 × 10/100 Mbps WAN, 1 × 10/100 Mbps LAN (as per the series sheet) for the FXS models. dasscom.com
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Physical & environmental:
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Dimensions (for “16FXS” size): ~435 × 199 × 44 mm (LxWxH) for full size unit in series sheet. dasscom.com
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Power supply: AC 85-265 V, 47-63 Hz for some models; typical consumption ~20 W for 16FXS. dasscom.com
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Operating temperature: approximately -10 °C to 60 °C (per the datasheet) and humidity 10-95% non-condensing. dasscom.com
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Telephony features: The series lists full analog telephone features: Caller ID display (CLI), Call transfer, Call waiting, DND, Hotline, distinct ring, pick up, three-party conference. dasscom.com
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Analog device support: Phones, fax machines, POS machines supported (since FXS ports). The series sheet mentions “connect a legacy telephone, FAX, POS …”. dasscom.com
⚠️ Things to Clarify / Consider
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“FXS” means the port supplies line to analogue device (telephone set). If you need to connect analogue trunk lines (PSTN) instead, you may need an “FXO” variant. Ensure you have the correct type.
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Concurrent call capacity: Although 16 ports, check how many simultaneous calls the gateway supports (some ports may be idle/fax only) — the sheet for “FXS Outbound Concurrent Call” shows e.g., 16 calls for the 16FXS model. dasscom.com
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Compatibility with Indian telephony environment: FXS ports should support Indian line voltage and CLIP (Caller ID) formats. Confirm with Dasscom/distributor.
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Support for fax machines: Ensure the model you get has robust T.38 or pass-through for faxes if needed.
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Network and QoS: For best voice quality, ensure the LAN/WAN infrastructure is sized properly (QoS, low latency, jitter). The gateway supports jitter buffering, packet loss compensation. dasscom.com
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Firmware & updates: Confirm the version, local distributor support, spare parts (if a port fails) and future firmware upgrades.
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Rack/desktop mounting: Check space, ventilation (16 ports with analog may generate heat) and power availability.








