Configuring Voice Services

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SIP Trunking and Hunt Groups on the SPA8000

 

 

 

 

 

 

 

 

 

 

NOTE Although the figure shows only one ITSP account, each standalone line and each Trunk Group can be configured with a different ITSP (with some limitations applied).

Setting the Trunk Group Call Capacity

The ITSP may set a limit to the number of calls that can be made on a trunk group. You can configure a trunk group’s call capacity parameter to meet the requirements of the ITSP. Both incoming call and outgoing calls are counted towards this limit. The call capacity has the following impact on call handling:

•Inbound calls: When the limit is reached, the Trunk UA replies 486 to the caller.

•Outbound calls: When the limit is reached, the Line UA plays a fast busy tone to the caller. Note that a trunk line can make an outgoing call only through its own trunk. If that trunk reaches full capacity, it will not attempt to failover to use other trunks.

You can configure this setting in the Voice tab > Trunk (T1 ... T4) page, Subscriber Information section, Call Capacity field. For more information, see “Configuring a Trunk Group,” on page 84.

Inbound Call Routing for a Trunk Group

An incoming call is handled as follows:

STEP 1 When an incoming call is detected by the Trunk UA, the UA first checks if there is capacity to handle the call. If there is insufficient capacity, the UA rejects the call with a 486 response.

STEP 2 If there is spare call capacity, the UA consults the Contact List to determine which line or lines to ring (that is, for the proxy to send SIP INVITE to), and starts “hunting.” (See “Configuring a Trunk Group,” on page 84)

STEP 3 When a line is selected to ring, one or more PBX phones may be alerted, according to the PBX features and configuration.

STEP 4 The Caller ID of the external Caller is signaled by the Line UA out to the FXS port using the configured Caller ID method (FSK, DTMF, etc.). The PBX must be able to detect Caller ID signal in order for the proper Caller ID to show.

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Cisco Systems WRP400, SPA2102, SPA3102, PAP2T Setting the Trunk Group Call Capacity, Inbound Call Routing for a Trunk Group
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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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