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Cisco® Hosted Collaboration Solution (Cisco HCS) is a widely accepted cloud service that enterprise customers are adopting. Customers are adopting Cisco HCS because it allows them to gain all the functions of a Cisco Unified Communications Manager environment with an effective pay-per-use service that the cloud can provide.
As enterprises adopt Cisco HCS, certain challenges arise, including how to ensure continuity of services when connectivity to the cloud is lost. Cisco Unified SRST is an example of a cloud connector, and it supports the Cisco HCS solution. Cisco Unified SRST is deployed at the customer premises and is orderable and supported on the Cisco ISR G2 routers. Cisco Unified SRST, generally offered by Cisco HCS partners, can be enabled with minimal configuration to the premises-based ISR router and the Cisco HCS.
In both of these options, enterprises should request the Cisco Unified SRST as part of their Cisco HCS deployments. Cisco Cloud Connectors are software components that improve the security, resiliency, or performance of cloud-based solutions. Now consider some of the specifics about platforms and capacities that are available with Cisco Unified SRST. For capacity planning the size of the router is used to determine the correct equipment to place at the customer premises to optimize the cloud experience (refer to Table 1). If you are reading this message, Please click this link to reload this page.(Do not use your browser's "Refresh" button). If you see this message, your web browser doesn't support JavaScript or JavaScript is disabled. Cisco 2901 Integrated Services Router Integrated Services Router offers embedded hardware encryption acceleration, voice- and video-capable digital signal processor (DSP) slots, optional firewall, intrusion prevention, call processing, voicemail, and application services. Through the Newegg EggXpert Review Program, Newegg invites its best reviewers, known as EggXperts, to post opinions about new and pre-release products to help their fellow customers make informed buying decisions.Click here for more details. International Shipping - items may be subject to customs processing depending on the item's declared value. Your country's customs office can offer more details, or visit eBay's page on international trade. Estimated delivery dates - opens in a new window or tab include seller's handling time, origin ZIP Code, destination ZIP Code and time of acceptance and will depend on shipping service selected and receipt of cleared payment - opens in a new window or tab. This item will be shipped through the Global Shipping Program and includes international tracking. Will usually ship within 5 business days of receiving cleared payment - opens in a new window or tab. By submitting your bid, you are committing to buy this item from the seller if you are the winning bidder. By clicking Confirm, you commit to buy this item from the seller if you are the winning bidder. By clicking Confirm, you are committing to buy this item from the seller if you are the winning bidder and have read and agree to the Global Shipping Program terms and conditions - opens in a new window or tab. Your bid is the same as or more than the Buy It Now price.You can save time and money by buying it now. By clicking 1 Click Bid, you commit to buy this item from the seller if you're the winning bidder. The CUSM completes the rest of the configuration for you based on your provision choice for the site (SRST-only, E-SRST, or based on a customized template). VerifyThere is currently no verification procedure available for this configuration.TroubleshootThere is currently no specific troubleshooting information available for this configuration. Refer to Cisco Technical Tips Conventions for information on conventions used in this document. This module provides configuration procedures for cisco 3900 series, cisco 2900 series, and cisco 1900 series integrated services routers (isrs).. Copyright © 2015 Caroldoey, All trademarks are the property of the respective trademark owners. As the enterprise extends its IP telephony deployments from central sites to remote branch offices and teleworkers, a critical factor in achieving a successful deployment is the capability to support backup call control at these remote locations. Cisco Unified SRST or Unified E-SRST is a critical component of a centralized call-processing architecture in which a Cisco Unified Communications Manager cluster, located at a central site, provides telephony services for all sites of an organization. A centralized call-processing architecture must include a strategy for survivability of telephony service at the remote locations (that is, at branch offices and the homes of teleworkers) when access to the centralized call-processing services is interrupted because of a WAN outage or other factors. Cisco Unified Communications Manager or Cisco Business Edition in combination with Cisco Unified SRST or Unified E-SRST, which is embedded in the Cisco IOS® Software, helps provide high-availability IP telephony to remote locations. The enhanced reliability makes Cisco Unified Communications a cost-effective solution to help ensure telephony operation for all users in an organization, whether they are located in the headquarters or in a remote location. Furthermore, in certain environments, the security of telephony communication is a critical requirement.

Cisco Powered Cloud Collaboration Service deployments powered by Cisco HCS are also a type of centralized call-processing architecture. Cisco developed Cisco Unified SRST technology for all Cisco IOS Software platforms that support call processing (refer to Table 2 for a complete list of supported platforms).
Cisco Unified SRST functions in the remote-location router to automatically detect a failure in the network and initiate a process to provide call-processing backup redundancy for the IP phones in that location and help ensure that the telephony capabilities stay operational. Cisco routers running Cisco Unified SRST also offer a secure voice mode with Cisco Unified SRST. Cisco Unified SRST supports Secure Client Control Protocol (SCCP) and Session Initiation Protocol (SIP) for Cisco IP Phones, providing basic telephony functions when the network SIP proxy or Cisco Unified Communications Manager is no longer available.
Based on Cisco Unified SRST and Cisco Unified SRST Manager, Cisco Unified E-SRST delivers all the benefits of Cisco Unified SRST along with improved management capabilities and better end-user experiences in survivability mode. Cisco Unified SRST Manager is the management tool and is included as part of the Cisco Unified E-SRST solution at no extra charge. Cisco Unified SRST Manager resides at the central site and collects information from Cisco Unified Communications Manager or Cisco Business Edition. Cisco Unified SRST Manager operates within a virtual machine, running in the VMware ESXi (5.0 or later) hypervisor environment.
For Cisco Unified E-SRST deployments, the branch office is configured in Cisco Unified Communications Manager Express-as-SRST mode on a Cisco Integrated Services Router (ISR). Figure 2 shows the supported topology model for Cisco Unified E-SRST at a branch-office site. Cisco Unified SRST and Unified E-SRST support 5 to 2000 phones on Cisco 800, 2900, 3900, and 4000 Series Integrated Services Router platforms.
Cisco offers ISR bundles with Cisco Unified SRST or Unified E-SRST at a discount when compared to separate purchase of bundle components. Cisco Unified SRST and Unified E-SRST are not dependent on Cisco Unified Communications Manager versions but on Cisco IP Phone loads. Table 5 lists the Cisco IP Phones using SIP that are supported by Cisco Unified SRST and Unified E-SRST. Table 6 summarizes the correlation between the Cisco Unified SRST version and Cisco IOS Software.
Secure Cisco Unified SRST for SIP phones is available with Cisco Unified SRST 8.0 and later versions. Cisco Unified Survivable Remote Site Telephony (Cisco Unified SRST) is a software and hardware solution that allows customers to maintain business connectivity during a time of lost telephony connectivity between their premises and the cloud service. For many, this means they can enjoy the benefits of the rich collaboration feature set and broad set of endpoint choices that are often missing in a traditional IP Centrex environment. Voice - and soon video - communications are such an essential part of a communications solution that businesses cannot continue without them. A reliant and redundant WAN architecture with multiple paths to ensure HCS connectivity is essential for business continuity. In a compromised situation, such as loss of connectivity to the cloud, maintaining telephony access is essential to ensure productivity. In cloud-based solutions, partners cannot afford to do much manual maintenance - automation is an essential component of an effective cloud service. In the Cisco HCS solution, telephony survivability can be accomplished with standard Cisco SRST configurations on the customer premises equipment (CPE)-based Cisco Integrated Services Routers Generation 2 (ISR G2) routers.
If the WAN link to the remote location fails and the connection to the Cisco HCS is lost, the phones are automatically redirected to the Cisco Unified SRST router, which takes over and provides the functions of Cisco HCS.
The capacity of the SRST functions starts from as low as 5 users on the Cisco 800 Series Integrated Services Routers and scales up to 1500 users for the Cisco 3945E Integrated Services Router. Cisco HCS is a leading infrastructure-as-a-service (IaaS) offering that eliminates much of the overhead and support costs for an enterprise voice and video collaboration deployment. Cisco Unified SRST is an example of a Cloud Connector that is part of a Cloud Intelligent Network to provide customers an enhanced experience when using cloud services.
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Cisco® Unified Survivable Remote Site Telephony (Unified SRST) and Cisco Unified Enhanced Survivable Remote Site Telephony (Unified E-SRST) provide cost-effective solutions for supporting redundant call control in remote branch offices and the homes of teleworkers.

The architecture provides numerous benefits for enterprises, including centralized and simplified management.
Call-processing redundancy in the remote location is particularly critical during an emergency (which may be the actual cause of the WAN outage). When access to Cisco Unified Communications Manager from a remote location is lost, for example, as a result of a WAN link failure, Cisco Unified SRST or Unified E-SRST provides telephony backup services to help ensure that the remote location has continuous telephony service. This solution supports secure telephony communication between any two phones in the network, whether those phones are in the headquarters facility or at a remote location. Based on Cisco Unified Communications Manager, Cisco HCS offers industry-leading collaboration technologies for secure and scalable clouds from partners certified to offer Cisco Powered Cloud Services. Cisco Unified SRST integrates network intelligence into Cisco IOS Software, which acts as the call-processing engine for IP phones located in the remote locations during a WAN outage (Figure 1). Upon restoration of WAN connectivity, the system intelligently and automatically shifts call processing back to the primary Cisco Unified Communications Manager cluster.
If secure voice is deployed with Cisco Unified Communications Manager at the central site, secure Cisco Unified SRST allows you to keep calls secure during Cisco Unified SRST mode with Transport Layer Security (TLS) and Secure Real-Time Transport Protocol (SRTP) for signaling and media encryption. The Cisco Unified SRST router uses the proprietary SCCP protocol to register the SCCP phones and the SIP registrar services to support SIP phones. It enables automatic provisioning of branch-office routers and provides a richer telephony experience during failover mode by auto-provisioning the branch-office routers with features such as hunt groups, call park and pickup, and an ephone template from the centralized Cisco Unified Communications Manager. Cisco Unified SRST Manager collects configuration information required for advanced features such as hunt groups and pickup groups, and distributes the configuration information to the branch-office sites. The software is packaged as an open-virtualization-archive (OVA) template for installation within the virtual-machine environment.
Cisco Unified E-SRST provisions the branch-office site using the Cisco Unified SRST Manager with information such as phone users, MAC addresses, and advanced telephony features configured on Cisco Unified Communications Manager or Cisco Business Edition.
Table 4 lists the Cisco IP Phones supported by Cisco Unified SRST and Unified E-SRST with SCCP phone loads.
Overall, the service is a win for both partners that can offer this new and effective cloud-based service and enterprise customers who can take advantage of the cloud without a compromise on reliability (Figure 1). With this level of importance of a specific service, enterprises must consider the idea of resiliency in the face of a cloud outage. Cisco Unified SRST aims to provide even more resiliency, allowing for the survivability of call control when all connectivity to the cloud-based voice services is lost. When the disrupted WAN link is restored, the phones automatically re-register with Cisco HCS - no manual intervention is required. Cisco HCS provides dedicated virtual appliances in the cloud to deliver collaboration services without the expense of purchasing and maintaining physical servers. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. Both Cisco Unified SRST and Unified E-SRST support Cisco Unified Communications Manager and Cisco Business Edition. Cisco Unified SRST contributes to this secure telephony communication solution by supporting the same secure telephony protocols in a remote location when that location loses communication with the centralized Cisco Unified Communications Manager. Cisco HCS is located at the providera€™s data center with the enterprises it serves acting like remote-office locations. The Cisco Unified SRST configuration needs to be completed only once, during the initial installation, simplifying deployment, administration, and maintenance. When the WAN link or Cisco Unified Communications Manager service is restored, Cisco Unified Communications Manager resumes secure call-handling capabilities. Cisco Unified SRST offers fault monitoring using Simple Network Management Protocol (SNMP) with the SRST MIB, which allows you to remotely monitor the Cisco Unified SRST site using existing SNMP tools or CiscoWorks.
If a WAN outage occurs, when the Cisco Unified E-SRST service running on the branch-office routers takes over call processing, it applies the configuration provisioned by Cisco Unified SRST Manager to provide enhanced telephony services at the branch-office sites. The OVA file includes the Cisco Unified SRST Manager software, as well as the virtual-machine system settings preconfigured to operate with Cisco Unified SRST Manager. Cisco Unified SRST provides an additional improvement of this cloud-based solution by providing ongoing telephony survivability when access to the cloud is lost (Figure 2). Cisco Unified SRST also provides reliable cloud communications and supports Cisco Powered Cloud Collaboration Services powered by Cisco Hosted Collaboration Solution (HCS). If communications from the Cisco Powered Cloud Service to the enterprise fail, Cisco Unified SRST provides the telephony backup service to help eliminate business disruption as described throughout this document. The Cisco SRST MIB provides the network operations center details about Cisco Unified SRST activity, including duration of Cisco Unified SRST use, IP phones registered or registration failure, and calls processed during SRST mode. A backup WAN link connection is required to receive Cisco SRST MIB data at the central site in SRST mode.

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