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NN10029-111
Succession Multimedia Communications Portfolio
MCP SIP Application Module
Basics
Standard MCP 1.1 FP1 (02.02) April 2003
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Nortel Networks Confidential 3 Overview How this chapter is organized The SIP Application Module Overview contains the following subsections: • “Overview” on page 4 — Functional description — Network configuration — Interfaces —Protocols “Hardware” on page 11 “Services and features” on page 11 — “Routing and Translation services” on page 12 — “Interworking services” on page 16 — “Service package enforcement” on page 17 — “Authentication services” on page 17 — “Network/Address Hiding service
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4 Overview Nortel Networks Confidential Overview The SIP Application Module is a service execution engine that provides the following functionality: core signaling functionality enabling communication among SIP clients SIP proxy server Back-to-Back User Agent SIP Registration CPL interpretation Location server optional Presence subscription and notification (For more information on the Presence feature, see the MCP SIP Presence Basics document.) The SIP Application Module ha
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Nortel Networks Confidential Overview 5 — changing IP addresses in the contact header so that the SIP Application Module remains on the signaling path — modifying the Session Description Protocol (SDP) using values supplied by the RTP Media Portal to control media endpoints — providing advanced screening capabilities The architecture of a BBUA service consists of two user agent clients linked back-to-back through a proprietary interface. The BBUA is guaranteed to be on the signaling path o
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6 Overview Nortel Networks Confidential Redirect Server The SIP Application Module decides whether to proxy or redirect the call separately for each individual request. This decision is made based on subscriber service logic. If the decision is to redirect the request, a 302 Response message is returned with a list of alternate locations. Registration Server The Registration Server performs registration on messages it receives from clients. The Registration Server stores information
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Nortel Networks Confidential Overview 7 Figure 2 Example of network configuration SIP Application Module BigMart.com Management SIP Audio Module Servers BiggerMart.com Accounting PSTN Gateways Modules Copyright © 2003, Nortel Networks MCP SIP Application Module Basics
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8 Overview Nortel Networks Confidential Interfaces The SIP Application Module interfaces with numerous other components. See Figure 3, “Network interfaces.” Figure 3 Network interfaces Private network PSTN or PBX Public network Legend Access Access Signaling client client Media stream NN10029-111 Standard MCP 1.1 FP1 (02.02) April 2003 Copyright © 2003, Nortel Networks
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Nortel Networks Confidential Overview 9 Protocols The SIP Application Module uses various protocols to support SIP clients, including the Management Module, RTP Media Portal, Database Module, and the PSTN Gateways. The protocols use an IP backbone to connect the components. These interfaces are shown in Figure 3, “Network interfaces.” Figure 4 Protocols DTP SQL SIP SIP OMI Private network PCP PSTN MGCP+ SIP or PBX SIP SIP SIP SIP Public network SIP SIP Legend Access Access Signaling clie
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10 Overview Nortel Networks Confidential Table 1, “SIP Application Module protocols,” gives details about these interfaces. Table 1 SIP Application Module protocols Protocol Functional component SQL Structured Query Language Interface to the Database Module SIP Session Initiation Protocol Interface to the SIPclients SIP Audio Server IP Client Manager (IPCM) SIP PRI Gateway Web Client Manager OMI OpenManagement Interface Interface to the SIP Management Module MGCP+ Media Gateway Co
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Nortel Networks Confidential Overview 11 Hardware Refer to Table 2, “Minimum hardware requirements,” for the list of required hardware. Table 2 Minimum hardware requirements Sun Netra t 1400(DC) /1405 (AC) Description 4-440 Mhz Ultra Sparc II CPUs 4 GB RAM 2-36 GB Ultra SCSI disk drives 1-32X Internal CDROM drive (bootable) 24 GB 4 mm internal tape drive 1 Quad Fast Ethernet PCI card 1 PCI UltraSCSI card AC (t 1405)/DC (t 1400) power supplies Services and features The SIP Application Module p
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12 Overview Nortel Networks Confidential Service package enforcement Authentication services Converged PC service Network/Address Hiding 911 Notification support Instant Messaging Presence Voicemail server interoperability and MWI (message waiting indication) notification Registration Network address book Overload control Reliability and fault tolerance Routing and Translation services Foreign termination If an incoming request specifies a domain that is not served b
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Nortel Networks Confidential Overview 13 details). If this step also fails, the SIP Application Module attempts a general DNS A-record lookup to route the request. Note: The DNS A-record is the traditional response given by a DNS. It translates a domain name into an IP address. If any of these steps succeed, the SIP Application Module routes the request. If all these methods fail, the SIP Application Module rejects the request. Call Transfer service The SIP Application Module handles the
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14 Overview Nortel Networks Confidential These routes include routes for private digit dial plans, routes to gateways, and telephony-style routing between SIP domains. Multiple lists can reuse the same routes in a route list. assign class of service (COS) COS is basically used to block particular types of calls, such as international dialing or long-distance dialing. For example, telephones in an office lobby can be restricted to local and emergency calls only in a domain. Figure 5, “
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Nortel Networks Confidential Overview 15 URL addresses specifying an appropriate gateway. It supports the use of digit translation and digit manipulation. A route list is assigned a single COS. The route list provides the following additional options that can restrict incoming sessions from using the domain’s telephony resources: allow/block all incoming sessions from other domains allow/block all incoming sessions from other subdomains redirect session to the originator’s domain. Th
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16 Overview Nortel Networks Confidential With simultaneous ringing, the call terminates to multiple routes at the same time. The first terminating route to answer is accepted and the rest of the routes are released. With sequential ringing, the call tries to terminate to only one of several routes at a time. Route advancement occurs whenever an error response is received, a provisionable No Answer timer expires, or a redirect response is received. Call Processing Language The SIP Applica
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Nortel Networks Confidential Overview 17 devices. Information for each component is stored in .xml format to provide flexibility when describing the capabilities of the component. Bearer Path Control The SIP Application Module uses the RTP Media Portal to control media streams originating from and terminating to non-compliant SIP devices if they do not support media negotiations. The exception to this occurs when the originating and terminating parties are both the same device type. If b
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18 Overview Nortel Networks Confidential authentication fails since the database does not have the subscriber's information. As a result, the call is blocked. Administrators can configure whether they want a call from an unknown foreign domain authenticated or not. System administrators can also specify foreign proxies in the NodalAuth field of the Authentication tab. In this way, no requests originating from those proxies are failed because of authentication. Note: The following defini
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Nortel Networks Confidential Overview 19 The Converged service adds the following capabilities to the end user's telephony service: the ability to manually redirect incoming calls to another party from the PC the ability to set up automated enhanced routing and screening of incoming calls based on time of day or based on the calling party's identity a call log of all incoming calls the ability to send instant messages to the party on the other end of a call the ability to start
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20 Overview Nortel Networks Confidential The RTP Media Portal handles Network Hiding for the media stream. For information on the RTP Media Portal, refer to the MCP RTP Media Portal Basics document. Note: The SIP Application Module cannot map SDP information without an RTP Media Portal. It only performs address mapping for SIP header fields. Therefore, SDP passes through untouched. If the server must map SDP address information, then you need an RTP Media Portal. The SIP Application Mod
