SIP Trunk Northwest Branch Training April 2013

apprehensiveheehawNetworking and Communications

Oct 25, 2013 (4 years and 13 days ago)

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SIP Trunk


Northwest Branch Training


April 2013


Todd Kawamura

CenturyLink Sales Engineer


SIP Trunk


Northwest Branch Training

What we should all know about SIP Trunk



What is SIP & brief history


Primary advantages & benefits of SIP


Sweet spot for SIP opportunities


What to look for


Configuration Elements

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SIP Trunk


Northwest Branch Training

What we should all know about SIP Trunk




What is SIP & Brief History



SIP stands for “Session Initiation Protocol”



It’s an IETF standard RFC3261 first published in 2002



Based on many of the features in HTTP and SMTP protocols



SIP is the signaling protocol to setup and process VoIP calls



RTP is SIP’s companion protocol that’s used to carry the audio

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SIP Trunk


Northwest Branch Training

What we should all know about SIP Trunk




Primary Advantages & Benefits of SIP



Fault
-
Tolerance: Ability to build in different levels of diversity



Cost
-
Effectiveness: Barrier to entry is low, as is marginal expense



Scalability: Easy to add more capacity with SIP



Flexibility: Lots of options to adjust call bandwidth, call flow, etc.



Manageability: QControl gives users lots of control over SIP service



Centralizability:


One vendor to deal with for PSTN


Consolidation of PSTN access lines


Centralized TN management

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SIP Trunk


Northwest Branch Training

What we should all know about SIP Trunk




Sweet spot for SIP opportunities: Customer...



Has QoS
-
enabled IP WAN now



Already has a VoIP solution in place



Has multiple remote/branch locations with traditional PSTN access



Views telephony as business
-
critical to enterprise (e.g., call center)



Has seasonal fluctuations or other unanticipated call
-
flow variations

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SIP Trunk


Northwest Branch Training

SIP
Trunking

Configuration Elements


SIP engineering considerations


Session sizing


Bandwidth sizing


Session
-
by
-
type sizing (Usage and Flat session quantity)


SIP Diversity options (Enterprise, Switch)

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SIP Trunk


Northwest Branch Training



Determine

total session (i.e., trunking) requirements for enterprise



Methods

include:

o

Peg counts from traffic study

o

CDR data from customer’s PBX

o

Rule of thumb method agreed to by customer

SIP Trunk


Northwest Branch Training


Determine

how many sessions by type (Flat or Usage)

o

Flat Inbound Call Types (from PSTN) : Local TN, DID

o

Flat Outbound Call Types (to PSTN): Local (including 411, 711, 911)



Usage Inbound Call Types (from PSTN): 8xx, RDID



Usage Outbound Call Types (to PSTN): LD, Alien TN (non
-
SIP TN)

SIP Trunk


Northwest Branch Training



For

each access line, determine max sessions



Determine circuit type / L2 protocol (HDLC, PPP, Ethernet)



Determine VoIP packet sample size



Determine Qty of G.711 calls



Determine Qty of G.729 calls


Determine % of IQ circuit that is for P1 traffic



Determine % of P1 bandwidth that is VoIP (QVUR)

SIP Trunk


Northwest Branch Training

What we should all know about SIP Trunk



Diversity Options Simplified (I hope)

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SIP Trunk


Northwest Branch Training

SIP Trunk


Northwest Branch Training

SIP Trunk


Northwest Branch Training

SIP Trunk


Northwest Branch Training

SIP Trunk


Northwest Branch Training