You can likely change the dial string to prepend a 1 before sending the invite to the carrier. For example on a Cisco SPA device you can use <:1>xxxxxxxxxx to prepend a 1 to a 10-digit number. It looks like the GS equivalent is <=1>xxxxxxxxxx
VoIP
Rules
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Be civil. Disagreements of varying intensities will happen, but particularly vitriolic attacks will be pruned from the discussion.
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Do not promote or advertise for any business, service or product unless responding to a specific request for recommendations. This includes recommending a user change providers when they have not indicated they are interested in doing so.
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Do not send private messages to users, or invite users to send you a private message, for the purpose of promoting or advertising a business, service or product.
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Do not invite, encourage, or seek help with engaging in unethical or fraudulent activity relating to VoIP, such as call spoofing, robocalling and autodialers, or fraudulent STIR/SHAKEN attestation.
In Voip.MS, you can just do 10 digit dialing by choosing "NANPA" as the choice for "Dialing Mode" in the Account Settings -> General tab
Not going to lie, I don't know shit about grandstream ata's, but is there not a way to prepend 1 to all calls? or 1 to any 10 digit call?
Also weird that callcentric doesn't parse the call without the end user needing to dial 1. My company (5 different platforms atm) does it with out needing the 1, only exception is toll free dialing, the 1 is still required.