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Joined: Aug 2002
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I have a customer using freepbx with sip client on their cell phone. Grandstream wave stopped working. So we tried Zoiper and it works, but not on mobile data / cellular data. This is the only user with this problem (Iphone on Tmobile) The extension is the PJ_SIP on freepbx, port 5060. Would it make sense to switch that extension to chan_sip on port 5160? Is it possible Tmobile is blocking sip traffic /registration?
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Joined: Aug 2004
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I've heard of Tmobile causing problems for VoIP - more to do with IPv6 behind the scenes if I remember correctly. Any chance your client could VPN their cell phone to the office and work around the problem that way?
chan_sip probably wouldn't help anything...
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Joined: Aug 2002
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The Freepbx instance is in the cloud, I am not too interested in setting up VPN on the cell phone etc. I will test using an alternate port or IAX as a last resort. Maybe we can bypass whatever block is there.
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Joined: Aug 2002
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IAX using Zoiper seems to be more reliable and possibly bypasses whatever is in the way. Anyone have an opinion why I should't be using IAX instead of SIP.
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Joined: Aug 2004
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IAX is probably a good work around. All the information passes on the same port number (unlike SIP) which usually improves NAT traversal.
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