--- title: Send your first call with a tech prefix url: https://help.telecomsxchange.com/buyers/send-your-first-call/ audience: For Buyers summary: 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. updated: '2026-10-21' verified_commit: 83b4ebc96d0081a25213776d5a8871bd04941125 --- # Send your first call with a tech prefix > 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 switch**: Authorized IP or VoIP login on your account 2. **TelecomsXchange** (via `80039#447700900123`): sip01 on port 5060 picks the route and bills 3. **Seller's switch** (via chosen route): Carries the call on the purchased route 4. **CDR (Voice)** (via when the call ends): Duration, cost and SIP code recorded 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](https://help.telecomsxchange.com/buyers/find-and-buy-routes/) in Market View. - [Create an account](https://help.telecomsxchange.com/buyers/create-your-first-account/) with your switch's IP address or a VoIP login. TelecomsXchange uses it to recognize your calls. ![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](https://help.telecomsxchange.com/assets/diagrams/call-flow.svg) ## 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](https://help.telecomsxchange.com/assets/screenshots/buyer-interconnections.jpg) 3. Point your switch to host `sip01.telecomsxchange.com`, port `5060`. 4. Dial the tech prefix followed by the number in E.164 format, without `+` or `00`. For example `80039#447700900123`. 5. 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](https://help.telecomsxchange.com/buyers/call-records-and-live-calls/). ## 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: ``` 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](https://help.telecomsxchange.com/buyers/routing-groups-and-route-testing/) 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](https://help.telecomsxchange.com/buyers/routing-groups-and-route-testing/#how-do-i-use-a-routing-group-for-sms). ## 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](https://help.telecomsxchange.com/buyers/preferences-notifications-messages/) 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**. | ## Frequently asked questions **Q: What is a tech prefix?** A: 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. **Q: Where do I send my SIP traffic?** A: 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. **Q: What number format should I dial?** A: The tech prefix, then the number in international E.164 format without + or 00. For example 80039#447700900123. **Q: Which codecs are supported?** A: The Purchased Route Confirmation email lists G.729, G.723 and G.711 for SIP routes. **Q: When do I get the Purchased Route Confirmation email?** A: 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. **Q: Can a seller block my route?** A: 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.