How many SIP trunks does a call center need?

One trunk per platform or site. There is no per-channel fee and no set channel count; concurrent calls are bounded by your bandwidth and by a fraud-protection limit that we raise on request to match your peak.

What is the best SIP trunk provider for call centers?

The one whose published rates, capacity policy, attestation and platform integration you can verify before signing. IPComms publishes all four on this page: $0.010 per minute outbound, no channel fees, every call signed at A attestation, and a page per contact-center platform describing exactly how the trunk connects.

Can international call centers use US SIP trunks?

Yes. Centres in the Philippines, India, Colombia, Mexico, South Africa and elsewhere connect their platform to our US points of presence over the internet and present US local or toll-free numbers to callers. Latency to the US edge is the practical limit; a test trunk shows you the real figure from your site.

How much does SIP trunking cost for a call center?

Minutes times the per-minute rate plus $1.50 per number per month; nothing per channel or per agent. A 300-seat centre doing 1.5 million minutes a month pays $15,000 in outbound usage. Above about two million minutes a month, ask for a volume rate.

Do you accept auto-dialer or campaign traffic?

No. IPComms carries manual, human-initiated conversational traffic only. Predictive and auto-dialers, robocalling, voice broadcasting and campaign blasting are prohibited by the acceptable use policy and accounts running them are disconnected. Inbound support, outbound sales made by agents, and blended centres are what the network is built for.

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SIP trunking for call centers

Termination and origination for inbound, outbound and blended centres, from a US carrier operating since 2002. $0.010 per minute outbound, $0.009 inbound, $0 per channel, every call STIR/SHAKEN-signed at A attestation, and a connection page for the platform you already run.

Rates at volume

Item	Price
Outbound calling, US and Canada	$0.010 / min
Inbound to local numbers	$0.009 / min
Inbound to toll-free numbers	$0.020 / min
Per channel / concurrent call	$0
Local number, US	$1.50 / month, $1.00 setup
Toll-free number	$2.00 / month, $1.00 setup
E911, per number	$2.50 / month
Port a number in	$5.00 one-time
Term contract	None

Full rate sheet: SIP trunking pricing

Worked example

Our side of the comparison. Put your current telephony invoice beside it.
Usage	IPComms cost
500,000 outbound minutes	$5,000
500,000 inbound minutes, local numbers	$4,500
500,000 inbound minutes, toll-free	$10,000
500 concurrent calls, any month	$0
1,000 local numbers	$1,500 / month

Nothing per agent, nothing per channel. Above roughly two million minutes a month, ask for a volume rate in the form; we quote in writing.

Capacity and turn-up

A trunk has no channel count to buy. New trunks, endpoints and numbers are provisioned in the portal immediately. New accounts start with a fraud-protection limit on concurrent calls and calls per minute; tell us your peak and support raises it before you go live, and again when you win a contract. Adding a second site or platform is another trunk on the same account, same rates.

Your platform

Each page states how the trunk connects under that platform’s BYOC model, what stays with the platform and what moves to us, with the vendor’s own field names.

Genesys Cloud CX: BYOC Cloud and BYOC Premises
Five9: BYO SIP trunk, direct peering
Talkdesk: xConnect BYOC via your SBC
Webex Contact Center: Local Gateway / vPOP
Zoom Contact Center: BYOC Premises Peering
Asterisk, FreeSWITCH, Vicidial-free dialers, any SIP PBX: Standard SIP trunk

Network

Your platform or PBX connects to either or both points of presence; inbound calls for your numbers are delivered to both; outbound calls leave through multiple upstream carriers over SIP TLS with SRTP, with automatic failover.

Two points of presence, encrypted on both legs when you use TLS.

Specifications

Signaling and media: SIP over UDP/TCP 5060 or TLS 5061; RTP or SRTP (SDES); G.711 µ-law and A-law, G.729
Authentication: IP allow-list (several addresses per trunk) or digest registration
Points of presence: Two, geographically separate (US East, US West); inbound delivered to both
Upstream: Multiple carriers, reached over SIP TLS with SRTP; automatic failover on the outbound path
STIR/SHAKEN: Every call is signed at A attestation, outbound and inbound
Caller ID: Any number on the account, selectable per trunk or per call; numbers not on the account are rewritten to one that is
Numbers: Local numbers in US and Canadian area codes; toll-free 800/888/877/866/855/844; porting at $5.00 per number
E911: Dispatchable location per number (Kari’s Law, RAY BAUM’S Act)
Records: Per-call detail records with source IP, codec, transport and cost in the portal; SIP traces per call for troubleshooting

Traffic we carry

Human-initiated conversational calls: inbound support, agent-placed outbound, blended operations, in any volume. Predictive and auto-dialers, robocalling, voice broadcasting and press-1 campaigns are prohibited by the acceptable use policy; accounts running them are disconnected. That policy is also why numbers on this network are not the ones carriers’ analytics engines learn to flag.

Offshore and nearshore centres

Centres outside the US connect over the internet to our US points of presence and present US local or toll-free numbers. Country pages: Philippines, India, Colombia, Mexico, South Africa, all countries; Spanish: troncal SIP para call centers.

Questions operations teams ask

How many SIP trunks does a call center need?: One trunk per platform or site. There is no per-channel fee and no set channel count; concurrent calls are bounded by your bandwidth and by a fraud-protection limit that we raise on request to match your peak.
What is the best SIP trunk provider for call centers?: The one whose published rates, capacity policy, attestation and platform integration you can verify before signing. IPComms publishes all four on this page: $0.010 per minute outbound, no channel fees, every call signed at A attestation, and a page per contact-center platform describing exactly how the trunk connects.
Can international call centers use US SIP trunks?: Yes. Centres in the Philippines, India, Colombia, Mexico, South Africa and elsewhere connect their platform to our US points of presence over the internet and present US local or toll-free numbers to callers. Latency to the US edge is the practical limit; a test trunk shows you the real figure from your site.
How much does SIP trunking cost for a call center?: Minutes times the per-minute rate plus $1.50 per number per month; nothing per channel or per agent. A 300-seat centre doing 1.5 million minutes a month pays $15,000 in outbound usage. Above about two million minutes a month, ask for a volume rate.
Do you accept auto-dialer or campaign traffic?: No. IPComms carries manual, human-initiated conversational traffic only. Predictive and auto-dialers, robocalling, voice broadcasting and campaign blasting are prohibited by the acceptable use policy and accounts running them are disconnected. Inbound support, outbound sales made by agents, and blended centres are what the network is built for.