MVA Jump Startdownload.microsoft.com/download/0/E/4/0E4328EC-EDE2-4B37...Lesson 1: Connecting to the...
Transcript of MVA Jump Startdownload.microsoft.com/download/0/E/4/0E4328EC-EDE2-4B37...Lesson 1: Connecting to the...
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MVA Jump Start
Module6
PSTN Integration
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Module Overview
• Connecting to the PSTN
• Connecting to the existing PBX
• M:N Interworking Routing
• Call Routing Reliability
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Lesson 1: Connecting to the PSTN
• Background Definitions
• UCOIP
• Typical Legacy Enterprise PBX
• Decision 1: Legacy PBX integration
• Decision 2: POTS/TDM or SIP Trunking
• Direct connect via a Gateway
• Direct Connect via SIP Trunking
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Background Definitions
• Public switched telephone network (PSTN)
• Private Branch eXchange (PBX)
• Voice over Internet Protocol (VoIP)
• Session Initiation Protocol (SIP)
• Internet Telephony Service Provider (ITSP)
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UCOIP
• Unified Communications Open Interoperability Program
Qualified
Gateway
Qualified
PBX
Supported
PBX
http://technet.microsoft.com/ucoip
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Typical Legacy Enterprise PBX
PSTN
Dialing Habits
4 digit internal extensions
9 for an outside line
3 digits + extension for other locations
Class of Service
Inbound/Outbound
Local, National
Class of Service
Outbound only
Local, National,
and International
Numbering Plan
31-20-500 1000 to
+31-20-500 1999
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Decision 1: Legacy PBX integration
PSTNPSTN
Connect Lync to the Legacy PBX
Connect Lyncdirectly to the PSTN
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Decision 2: POTS/TDM or SIP Trunking
Connect via SIP Trunk
Connect via Gateway
PSTN
PSTN
SIP TDM
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Direct connect via a Gateway
• A gateway is a physical device that connects two incompatible
networks
• The gateway translates signaling and media between Lync (SIP) and
the PSTN
• Use supported gateways (UCOIP)
PSTN
SIP TDM
Lync Pool
Lync
Mediation
Server
Qualified
PSTN
Gateway
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Direct Connect via SIP Trunking
• IP connection that establishes a SIP communications link between
your organization and an Internet telephony service provider (ITSP)
beyond your firewall
• Use supported SIP Trunking Provider (UCOIP)
PSTN
SIP TDM
Lync Pool
Lync
Mediation
Server
Qualified
IP-PSTN
Gateway
Session
Border
Controller
(SBC)
VPNEnterprise Network ITSP Network
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Lesson 2: Connecting to the existing PBX
• Connecting through PBX via SIP
• Connecting through PBX via Gateway
• PSTN Sizing
• Inter-Trunk Routing
• Routing of IP-PBX Calls to PSTN via Lync
• Routing of IP-PBX Calls to another IP-PBX via Lync
• Configuring Inter-Trunk Routing
• Mediation Server
• Media Bypass
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Connect through PBX via SIP
PSTN
Lync Pool
Qualified or
supported
IP-PBX
Lync
Mediation
Server
SIP TDM
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Connect through PBX via Gateway
PSTN
Lync Pool
TDM or
unsupported
PBX
Lync
Mediation
Server
SIP TDM
Qualified
IP-PSTN
Gateway
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PSTN Sizing
1. In replacement scenarios, existing call volume is known
2. Account for new behaviors and features:
• Simultaneous ringing
• PSTN conferencing
• Dial-in audio conferencing
• Leverage the Lync Server 2013 Planning Tool
• Use Erlang B calculations when appropriate
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Inter-Trunk Routing
Lync Server 2013
Inter-trunk Routing
IP-PBX to IP-PBX
Peer to Peer Routing
without Lync
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Routing of IP-PBX Calls to PSTN via Lync
PSTN
Lync Pool
Lync
Mediation
Server
Lync
Mediation
Server
Qualified
PBX
Qualified
PBX or
Gateway
Media
Inbound
Trunk
PSTN
UsageRouting
Outbound
Trunk
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Routing of IP-PBX Calls to another IP-PBX via Lync
Lync Pool
Lync
Mediation
Server
Lync
Mediation
Server
Qualified
PBX
Media
Inbound
Trunk
PSTN
UsageRouting
Outbound
Trunk
Qualified
PBX
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Configuring InterTrunk Routing
• Use the Lync Management Shell
1. Configure a Voice route
2. Add a PSTN usage to a trunk configuration:
• New -PSTNUsages property has been added to CSTrunkConfiguration
• Use the Lync Control Panel
New-CsVoiceRoute -Identity RedmondRoute -PstnUsages @{add=“Redmond"}
-PstnGatewayList @{add="PstnGateway:redmondgw1.contoso.com"}
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Mediation Server
• Collocation vs. standalone– Collocation can offer significant server count reduction
– Standalone may be preferable for network zone placement or workload
isolation
• Media bypass and scalability– Scale based on hardware and transcoding mix
– For planning, don’t count calls with media bypass
• Pool vs. single server– If configuring your Lync pool for DNS load balancing, does your gateway or
SIP trunk support DNS load balancing?
– Is Enterprise Voice resiliency important?
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Media Bypass
http://technet.microsoft.com/en-us/library/gg398703.aspx
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Lesson 3: M:N Interworking Routing
• Interworking Routing − History
• Trunk and IP-PBX Interworking
• Trunk and IP-PBX Interworking – Real Life
• Configuration Details
• Trunks and Resiliency
• Multiple Sites to the Same Service Provider
• M:N Interworking Routing –Trunk Definition
• Auxiliary Calling Information
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Interworking Routing − History
Office Communications Server (OCS) 2007 R2:
One Mediation Server associated with one PSTN gateway, and vice versa (1:1)
Lync Server 2010:
Multiple PSTN gateways can be associated with the same Mediation Server pool (1:N); a
single PSTN gateway is associated with a single Mediation Server pool; a single SIP listening
port on the Mediation Server and on the gateway is used in the association
Lync Server 2013:
Introduces M:N Inter working routing. A particular PSTN gateway can be associated with
multiple Mediation Server pools or the same Mediation Server pool with multiple unique
associations.
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Trunk and IP-PBX Interworking
Trunk 1
Trunk 2
Trunk n
Qualified
IP-PBX
Lync
Mediation
Server
Configured Trunk
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Trunk and IP-PBX Interworking – Real Life
PBX-10
PBX Extension
PBX Extension
MTP-2
MED-10
Trunk 1MED-10<->PBX-10
PBX-10 port : 5060Signaling IP : PBX-1Media IP : MTP-1
Trunk 2MED-10<->PBX-10
PBX-10 port : 5061Signaling IP : PBX-1Media IP :
Media Bypass
Media Bypass
MTP-1
PSTN GatewayPBX-10
MTP-2
5060
5061
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Configuration Details
• Topology Builder:– Define the PSTN Gateway and Trunks
• Define the MTP as the Alternate Media IP-Address
• Use different gateway listening ports for each Trunk
– Publish the topology
• Windows PowerShell:– Identify the Trunk IDs
– Use Windows PowerShell to configure Media IP Addresses for the remaining
trunks
– Verify the Media IP address for the trunks
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Trunks and Resiliency
Mediation
Server MS1
Gateway GW1
Mediation
Server MS1
Gateway GW2
Trunk2
Trunk1
Trunk3
Po
rt
AP
ort
C
Po
rt
BP
ort
E
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Multiple Sites to the Same Service Provider
Lync Pool
Site 01
Mediation Pool
SBCsbc1.provider.com
Site 02
Mediation Pool
Trunk 1 Trunk 2
PSTN
MPLS
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M:N Interworking Routing –Trunk Definition
Trunk consists of the following mapping:
{Gateway FQDN, port} <-> {Mediation Server FQDN, port}
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Auxiliary Calling Information
Lync Server 2013
PSTN Phone
+1 (999) 555 2001
Incoming Call to
+1 (989) 555 0200
PSTN Phone
+1 (999) 555 1000
User Bob
+1 (989) 555 0200
Simultaneous Ring:
+1 (999) 555 1000
INVITE sip:[email protected];user=phone SIP/2.0
FROM: sip:[email protected];user=phone
TO: sip:[email protected];user=phone
HISTORY-INFO:
sip:[email protected];user=phone
ms-retarget-reason=forwarding,
sip:[email protected];user=phone
P-ASSERTED-IDENTITY:
<tel:+19995552001>
SIP Header sent to 19995551000
1
2
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Lesson 4: Call Routing Reliability
• Fast Failover & Options Polling
• Call-Routing Reliability – Lost connection
• Call-Routing Reliability – Gateway Down
• Call-Routing Reliability & Retries
• Call-Routing Reliability – Next-Hop Proxy
• Voice Routing Coexistence
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Fast Failover & Options Polling
• Gateway Log
• Mediation Server Log
1d:0h:12m:15s OPTIONS sip:192.168.1.41 SIP/2.0FROM: <sip:se01.tailspin.local:5068;transport=Tcp;ms-opaque=6b773cd98097b3f8>;epid=BE80B79150;tag=cdee90d70TO: <sip:192.168.1.41>CSEQ: 3 OPTIONSCALL-ID: 598db21985cb4d38a5e89a410987464aMAX-FORWARDS: 70VIA: SIP/2.0/TCP 192.168.1.52:59546;branch=z9hG4bK3b462b11CONTACT: <sip:se01.tailspin.local:5068;transport=Tcp;maddr=192.168.1.52>CONTENT-LENGTH: 0USER-AGENT: RTCC/5.0.0.0 MediationServer
1d:0h:12m:15s SIP/2.0 200 OKVia: SIP/2.0/TCP 192.168.1.52:59546;branch=z9hG4bK3b462b11From: <sip:se01.tailspin.local:5068;transport=Tcp;ms-opaque=6b773cd98097b3f8>;epid=BE80B79150;tag=cdee90d70To: <sip:192.168.1.41>;tag=1c1952373857Call-ID: 598db21985cb4d38a5e89a410987464aCSeq: 3 OPTIONSContact: <sip:192.168.1.41:5060;transport=tcp>Supported: 100relAllow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATEServer: Audiocodes-Sip-Gateway-/v.5.80A.053.005
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Call-Routing Reliability – Lost connection
Lync Mediation
Server Pool
MS-02
MS-01
Front End Server
Qualified
Gateways
GW-01
GW-02
GW-03
options
options
options
options
Route Policy:
For the example session only
Gateway GW-01 and GW-03
in that order can be used
SIP Configured Trunk
503 response
Control messages
No longer accessible
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Call-Routing Reliability – Gateway Down
Lync Mediation
Server Pool
MS-02
MS-01
Front End Server
Qualified
Gateways
GW-01
GW-02
GW-03
Route Policy:
For the example session only
Gateway GW-01 and GW-03
in that order can be usedoptions
options
options
504 response
SIP Configured Trunk Control messages
No longer accessible
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Call-Routing Reliability & Retries
Invite
183 responseFailed Connection
10 sec timer: start
Timer: stop
Lync Server 2010(FE) (MS) (GW)
Invite (trunk 1)
183 responseFailed Connection
10 sec timer-1: start
Timer-1: continues
Cancel (trunk 1)
Invite (trunk 2)
183 response
18x response
Invite
18x response
Timer-1: expires
10 sec timer-1: start
Timer-1: continues
Timer-1: Stops
Lync Server 2013(FE) (MS) (GW1) (GW2)
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Call-Routing Reliability – Next-Hop Proxy
• The Mediation Server tracks its next-hop proxy and backup next-hop
proxy by sending out periodic options polls: – Backup next-hop proxy is defined by Pool Pairing
• If the primary next-hop proxy is found to be down (failure to answer
to five options polls in a row), new invites from gateways are sent to
the backup next-hop proxy
• Additionally, a 10-second timer is used for incoming calls, so if the
primary next-hop proxy is used for a call and no SIP response is
received within this time, the call is rerouted to the backup next-hop
proxy
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Voice Routing Coexistence
Outbound Calls Home Server
Mediation Server
Lync Server 2013 2013 2013 Supported
Lync Server 2013 &
Lync Server 2010
2013 2010 Supported
2010 2013 Supported
Lync Server 2013 &
OCS 2007 R2
2013 2007 R2 Supported
2007 R2 2013 Not Supported
Inbound Calls Mediation Server
Next-hop Server
Home Server
Lync Server 2013 2013 2013 2013 Supported
Lync Server 2013 &
Lync Server 2010
2013 2013 2010 Supported
2010 2010 2013 Supported
Lync Server 2013 &
OCS 2007 R2
2013 2013 2007 R2 Supported
2007 R2 2007 R2 2013 Supported
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