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Send your first call with a tech prefix

Guide 5 of 155-minute readUpdated 21 October 2026

In short: Send calls from an authorized account to sip01.telecomsxchange.com port 5060 and dial the route's tech prefix before the E.164 number, for example 80039#447700900123. Each route's tech prefix is in My Interconnections and in the Purchased Route Confirmation email.

How a call reaches the seller
  1. Your switchAuthorized IP or VoIP login on your account
  2. then, 80039#447700900123, TelecomsXchangesip01 on port 5060 picks the route and bills
  3. then, chosen route, Seller's switchCarries the call on the purchased route
  4. then, when the call ends, CDR (Voice)Duration, cost and SIP code recorded
On this page
  1. Before you start
  2. How do I send my first call?
  3. What is in the Purchased Route Confirmation email?
  4. What is a tech prefix?
  5. What does My Interconnections show?
  6. How do I block or reactivate a route?
  7. How do I get alerted when route quality drops?
  8. What if something goes wrong?
  9. Common questions

A purchased route carries calls once your switch sends them to TelecomsXchange with the route's tech prefix. This guide shows the host, the dial format and how to manage your routes.

Before you start#

  • Buy a route in Market View.
  • Create an account with your switch's IP address or a VoIP login. TelecomsXchange uses it to recognize your calls.
How a call reaches the seller Your switch sends a SIP INVITE with the tech prefix and number to sip01.telecomsxchange.com port 5060. TelecomsXchange authenticates your account, rates and bills the call, removes the prefix and sends the call from 174.136.44.213 to the seller's switch, which delivers it to the called number. Your switch IP or SIP login on your TCXC account TelecomsXchange sip01:5060 1. authenticate 2. rate and bill 3. strip the prefix Seller's switch the route you purchased INVITE INVITE 33270#447700900123 447700900123 tech prefix + E.164 number from 174.136.44.213
How a call travels: your switch sends the tech prefix and number to sip01.telecomsxchange.com, which bills the call and sends it on to the seller's switch

How do I send my first call?#

  1. Make sure your switch sends calls from the account's authorized IP address, or registers with the account's VoIP login and password.
  2. Go to My Interconnections and find the route. Click its Tech Prefix to copy it; it briefly shows "Copied!".
My Interconnections, showing each route as your account, seller and route, with its status and tech prefix
  1. Point your switch to host sip01.telecomsxchange.com, port 5060.
  2. Dial the tech prefix followed by the number in E.164 format, without + or 00. For example 80039#447700900123.
  3. Open Live Calls to watch the call while it runs.

When the call ends you'll see its record, with duration, cost and SIP code, in Logs → CDR (Voice). See call records, live calls and stats.

What is in the Purchased Route Confirmation email?#

A few minutes after each purchase a background job sends you the Purchased Route Confirmation email, headed "You're Interconnected!". It lists the Seller, Route and Connected on time, then under Interconnection info the Host (host:port), Tech prefix and Protocol, with the route's full price list attached as a CSV. The seller gets a "Purchased Route Notification" with a link to your profile.

Voice (SIP) SMS (SMPP)
Host sip01.telecomsxchange.com smpp01.telecomsxchange.com
Port 5060 2776
Codecs G.729, G.723, G.711

What is a tech prefix?#

A tech prefix is a 5-digit code followed by #, for example 80039#. It tells TelecomsXchange which seller route to use for the call. Every route you buy has its own tech prefix.

The dial format is the tech prefix, then the number:

Text
80039#447700900123

Here 80039# picks the route and 447700900123 is the UK number. If you buy several routes to the same country, you choose one per call by changing the prefix. A routing group can also choose for you; its tech prefix starts with 444.

SMS routes work the same way with the SMPP host, but an SMPP account can also have a Default Route: on the account's Edit Account page, the purchased routes list shows a Default Route badge on one SMS route and a Make Default link on the others, and messages sent without a tech prefix use the default. The first SMS route you buy on an account becomes its default. An SMPP account can instead use a default routing group.

What does My Interconnections show?#

My Interconnections lists every route you've purchased as a path: your account → seller → route.

  • The cards at the top count Unique Sellers, Active Interconnects and Blocked/Inactive routes.
  • Status is Active, Blocked by You or Blocked by Seller; the legend under the table uses the same names.
  • Type is VOICE or SMS.
  • The search box filters as you type, by connection, seller, account or tech prefix, and shows "N of M interconnects match" with a Clear link.
  • Routes sold anonymously show the seller as Anonymous; clicking it opens a message to the seller.

The ⋮ menu on each row has Configure Route, Download (TCXC) and Download (Softswitch) for the route's rates, and Block Route or Activate Route.

How do I block or reactivate a route?#

  1. Go to My Interconnections.
  2. Click ⋮ on the route's row.
  3. Click Block Route. To use a blocked route again, click Activate Route.

The change applies at once, with no confirmation step. The status changes to Blocked by You, or back to Active. If the seller has blocked the route, the menu has no block option and the status stays Blocked by Seller until the seller unblocks it.

Warning

While a route is blocked you don't receive its rate update notifications. When you activate it again, download the rates to check the current prices.

How do I get alerted when route quality drops?#

  1. Go to My Interconnections, click ⋮ on the route's row and choose Configure Route.
  2. On Modify Purchased Route, fill in the thresholds you want (see the table below). Leave a field empty to skip it. Use whole numbers; decimals are rounded down when the check runs.
  3. Click Save Settings. Return to Accounts leaves without saving.

The route is checked once a day, after midnight UTC, against the previous day's traffic. The check only runs on routes that carried at least 10 calls (answered or failed) that day; with fewer calls nothing is compared, and Current ASR and Current ACD show N/A. When ASR or ACD is below a threshold you get an email, "TCXC Notification Tresholds met for -" or "TCXC BLOCK Tresholds met for -", with the measured and threshold values; the seller receives the same email. A block threshold also blocks the route. The thresholds are for voice routes only.

Setting What happens below it
Notify if ASR goes lower than (%) You get an email.
Notify if ACD goes lower than (seconds) You get an email.
Block if ASR goes lower than (%) You get an email and the route is blocked.
Block if ACD goes lower than (seconds) You get an email and the route is blocked.

The same page has a Block this route checkbox. It also shows the seller's Minimum ASR and Minimum ACD, your Current ASR, Current ACD and Daily Minutes, and a Download link for the rate sheet.

Tip

Compare your current ASR and ACD with the seller's minimums. If your traffic falls below them on a day with at least 10 calls, the seller's rules block the route automatically and you get the message "Purchased route has been blocked for seller:".

What if something goes wrong?#

You see What to do
Status Blocked by Seller The seller blocked you, or your traffic missed the seller's minimum ASR or ACD. Contact the seller from their profile, or use another route.
Purchased route has been blocked for seller This message means the seller's side blocked the route. Check its status in My Interconnections.
Status Active but calls on the route fail The seller may have blocked the whole route for all buyers, which doesn't change your status. Check the SIP code in the CDRs and contact the seller.
'Notify ASR' parameter expects numeric (or Notify ACD, Block ASR, Block ACD) Enter the threshold as a number, without % or letters.
No Routes Found You haven't purchased any routes yet. Buy one in Market View first.
No matching interconnects Nothing matches your search. Try part of a connection name, seller, account or tech prefix, or click Clear.

Common questions

What is a tech prefix?

A tech prefix is a 5-digit code followed by #, for example 80039#. It tells TelecomsXchange which purchased route carries the call. Each route has its own tech prefix.

Where do I send my SIP traffic?

To sip01.telecomsxchange.com on port 5060, from an IP authorized on one of your accounts or with the account's VoIP login. SMS routes use smpp01.telecomsxchange.com on port 2776.

What number format should I dial?

The tech prefix, then the number in international E.164 format without + or 00. For example 80039#447700900123.

Which codecs are supported?

The Purchased Route Confirmation email lists G.729, G.723 and G.711 for SIP routes.

When do I get the Purchased Route Confirmation email?

A few minutes after the purchase. It is sent by a background job, not at the moment you click Purchase, and carries the host, tech prefix, protocol and the route's price list.

Can a seller block my route?

Yes. A seller can block you on their route, and the route is also blocked automatically if your daily ASR or ACD falls below the seller's minimum on a day with at least 10 calls. My Interconnections then shows Blocked by Seller.

What is a tech prefix?
A tech prefix is a 5-digit code followed by #, for example 80039#. It tells TelecomsXchange which purchased route carries the call. Each route has its own tech prefix.
Where do I send my SIP traffic?
To sip01.telecomsxchange.com on port 5060, from an IP authorized on one of your accounts or with the account's VoIP login. SMS routes use smpp01.telecomsxchange.com on port 2776.
What number format should I dial?
The tech prefix, then the number in international E.164 format without + or 00. For example 80039#447700900123.
Which codecs are supported?
The Purchased Route Confirmation email lists G.729, G.723 and G.711 for SIP routes.
When do I get the Purchased Route Confirmation email?
A few minutes after the purchase. It is sent by a background job, not at the moment you click Purchase, and carries the host, tech prefix, protocol and the route's price list.
Can a seller block my route?
Yes. A seller can block you on their route, and the route is also blocked automatically if your daily ASR or ACD falls below the seller's minimum on a day with at least 10 calls. My Interconnections then shows Blocked by Seller.

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