Configuring Voice Services

4

 

SIP Trunking and Hunt Groups on the SPA8000

 

 

 

 

 

•?,hunt=ra;12;1,cfwd=14085550123

A wildcard character is used to represent “all trunk lines.” The Trunk UA chooses lines in random order (hunt=ra). If a selected line does not answer within 12 seconds (12), the Trunk UA chooses another line at random. If there is no answer after 1 cycle (1), the call is forwarded to forwarded to the specified number (cfwd=14085550123).

•?,hunt=ra;*;1,cfwd=14085550155

A wildcard character is used to represent “all trunk lines.” The Trunk UA chooses lines in random order (hunt=ra). The interval is *, meaning the hunt stops when a selected line starts ringing, and will ring the line until it answers, or the caller hangs up, or the line's ringer times out. If the ringer times out, the call is automatically forwarded to the specified number (cfwd=14085550155).

Outgoing Call Routing for a Trunk Group

Outbound calls on a trunk line are handled as follows:

STEP 1 When a PBX phone selects an outside line, the PBX looks for an open line. If the PBX finds an open line, it takes the line off hook and bridges the audio between the PBX phone and the line. On detecting the off hook signal, the SPA8000 Line UA plays dial tone and ready to collect digits from the PBX phone.

STEP 2 As the PBX phone user dials the number, the Line UA applies its dial plan to the number. If the Line UA detects an invalid number, it rejects the all by playing reorder tone, then howling tone, then silence. If a valid number is received, it sends a SIP INVITE message to the internal Proxy.

STEP 3 The Proxy routes the call to the trunk group UA for the line, and the trunk group UA will attempt to place the call to the ITSP if there is available capacity on the trunk. If there is no call capacity left on the trunk, the internal Proxy will reject the INVITE from the Line UA, which in turn terminates the call and plays reorder tone out to the FXS port.

NOTE The SPA8000 will also apply the Trunk Dial Plan on the number before sending out INVITE to the ITSP. This Trunk Dial Plan typically is redundant since the trunk should trust the number sent by the Line UA. By default the trunk dial plan allows any non- empty number: ([*#0-9A-D][*#0-9A-D].)

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Cisco Systems SPA2102, SPA3102, WRP400, SPA8000, PAP2T Outgoing Call Routing for a Trunk Group, ?,hunt=ra121,cfwd=14085550123
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PAP2T, SPA8000, SPA3102, WRP400, SPA2102 specifications

The Cisco Systems SPA2102 is a versatile Voice over Internet Protocol (VoIP) adapter that serves as a bridge between traditional telephony systems and modern IP networks. Designed primarily for small to medium businesses, the SPA2102 is highly regarded for its reliability, ease of use, and rich feature set. This device allows users to make and receive phone calls over the internet while maintaining the ability to connect traditional analog phones.

One of the standout features of the SPA2102 is its dual-port capability. The device includes two FXS ports, allowing users to connect two separate analog telephones. This makes it an ideal choice for businesses that want to retain their existing telephony infrastructure while transitioning to a VoIP system. The ability to utilize two telephone lines simultaneously provides flexibility and convenience, especially for users in a busy office environment.

The SPA2102 leverages Session Initiation Protocol (SIP) technology, which is widely recognized for its robustness and interoperability. The support for SIP ensures that the SPA2102 can work seamlessly with various VoIP service providers, offering users a broad range of options for their telecommunication needs. In addition to SIP, the device supports various codecs, including G.711, G.726, and G.729, allowing for flexible audio quality settings and bandwidth management.

Security is also a critical aspect of the SPA2102. It incorporates advanced encryption methods, such as Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS), to protect voice communications from potential eavesdropping. This focus on security makes the SPA2102 a reliable choice for businesses concerned about the confidentiality of their conversations.

The device is easy to configure and manage, thanks to its web-based interface. This allows administrators to quickly set up the adapter, manage network settings, and troubleshoot any issues that may arise. Furthermore, the SPA2102 supports Quality of Service (QoS) features, ensuring that voice traffic is prioritized over other types of network traffic, which enhances call quality and reliability.

Overall, the Cisco SPA2102 is a powerful, user-friendly VoIP adapter that combines traditional telephony with modern IP technology. Its dual-port capability, support for SIP, extensive security features, and ease of configuration make it a solid choice for businesses looking to innovate their communication systems while minimizing disruption. Whether used in a small office or a larger organizational setting, the SPA2102 continues to be a reliable component of VoIP solutions.
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