1. SIP Trunk – Northwest Branch Training April 2013 Todd Kawamura CenturyLink Sales Engineer

2. 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

3. 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

4. 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

5. 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

6. 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)

7. SIP Trunk – Northwest Branch Training
Determine total session (i.e., trunking) requirements for enterprise
Methods include:
Peg counts from traffic study
CDR data from customer’s PBX
Rule of thumb method agreed to by customer

8. SIP Trunk – Northwest Branch Training
Determine how many sessions by type (Flat or Usage)
Flat Inbound Call Types (from PSTN) : Local TN, DID
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)

9. 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)

10. SIP Trunk – Northwest Branch Training
What we should all know about SIP Trunk
Diversity Options Simplified (I hope)

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