Signal & Syntax · Messaging and A2P
What Is an SMS Grey Route?
A grey route delivers A2P SMS through a channel priced for person-to-person traffic. Grey routes skip the operator's A2P termination rate.A grey route delivers A2P SMS through a channel priced for person-to-person traffic. Grey routes skip the operator's A2P termination rate.A grey route delivers A2P SMS through a channel priced for person-to-person traffic. Grey routes skip the operator's A2P termination rate.
Also calledgray route · SIM farm route · bypass route
Example
Grey Route in Practice
Grey routes run through SIM farms or unofficial interconnects. Operators detect grey traffic with Grey routes run through SIM farms or unofficial interconnects. Operators detect grey traffic with Grey routes run through SIM farms or unofficial interconnects. Operators detect grey traffic with SMSSMS firewalls and block the traffic without warning. On a grey route, sender IDs and receipts come from the bypass. The terminating operator never sees the sender. firewalls and block the traffic without warning. On a grey route, sender IDs and receipts come from the bypass. The terminating operator never sees the sender. firewalls and block the traffic without warning. On a grey route, sender IDs and receipts come from the bypass. The terminating operator never sees the sender.
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Guide
How A2P SMS Reaches a Handset
The path from an API call to a delivery receipt. Read the guide →Run the Checks on Your Own List
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