We surveyed IT decision-makers who have implemented SIP trunking in their organizations in order to identify the benefits that SIP trunking offers beyond operational savings, as well as the top criteria for selecting a SIP provider.

1. Software Advice UserView:
SIP Trunking Report 2015
Lessons from real software users

2. To find the data in this report, Software Advice conducted a five-day survey of 30
questions. Our survey targeted IT decision-makers responsible for selecting and
implementing SIP trunking providers. We analyzed the data to determine:
• What are the benefits of SIP trunking beyond savings?
• What are the top criteria for selecting a SIP provider?
Abstract

3. When selecting SIP trunking providers, the respondents in our sample prioritize
security, quality of support and pricing structure.
Top Reasons for Selecting SIP Provider
Security
Quality of support
Pricing model
Domestic rates
Geographic coverage
International rates
Local number availability
Scalability
Vendor consolidation
0% 5% 10% 15% 20% 25%
3%
6%
7%
7%
8%
9%
16%
22%
23%
Percent of sample
N = 208

4. Our survey uncovered a shift from port-based pricing models (the traditional pricing
structure for SIP trunking) to user-based models.
SIP Provider Pricing Models
Unlimited pricing
User-based
Included minutes
Toll-free numbers
Port-based
Additional managed services
Metered pricing
DID numbers
e911 fees
0% 10% 20% 30% 40% 50%
18%
24%
28%
29%
32%
33%
36%
39%
41%
Percent of sample
N = 208

5. Many of the respondents in our sample have free calling between SIP addresses
and/or between numbers in their office networks.
Free Calling Types Offered by SIP Providers
Percent of sample
N = 208
SIP to SIP
Internal office
Calls in provider’s network
Local
0% 12% 24% 36% 48% 60%
43%
49%
51%
51%

6. The following chart shows the adoption rate of SIP trunking among organizations
with knowledgeable IT decision-makers, which is quite high.
SIP Trunking Adoption
Have implemented69%
Haven’t implemented24%
Not sure7%
N = 307

7. Our sample included a number of smaller organizations, which may be one reason
why we uncovered such a high level of SIP trunking adoptions.
Respondents’ Organization Size by Number of Employees
1 - 495%
50 - 999%
100 - 24915%
250 - 49914%
500 - 99921%
1,000 - 4,99925%
5,000 - 9,9994%
10,000 or more5%
N = 208

8. An overwhelming 96 percent of our sample is satisfied with the audio quality of
calls connected via their SIP trunking providers.
Satisfaction With Audio Quality
N = 208
Extremely satisfied27%
Very satisfied46%
18% Moderately satisfied
5% Minimally satisfied
3% No opinion

9. Eighty percent of our respondents report that voice traffic is “always” or “often”
prioritized effectively on their networks.
Frequency of Effective Voice Traffic Prioritization
N = 208
Always31%
Often49%
Sometimes18%
Rarely1%

10. The primary factor affecting provider uptime uncovered by our survey is the overall
complexity of the corporate network.
Provider Outage Frequency by Number of Sites in
Corporate Network
1
2
3
4
5 to 10
11 to 20
More than 20
0% 20% 40% 60% 80% 100%
4%
3%
31%
32%
22%
21%
24%
14%
61%
31%
11%
9%
12%
21%
23%
17%
15%
16%
26%
37%
15%
48%
22%
8%
42%
39%
30%
38%
16%
15%
N = 208
NeverVery often Often Sometimes Rarely

11. Most businesses with SIP trunking have already begun to cut down on the number
of providers they use for voice and data services.
Telecommunications Service Provider Consolidation
Full consolidation53%
Consolidated SIP and
Internet provider
29%
Consolidated SIP and
PBX provider
10%
N = 208
No consolidation8%

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