Some network providers block TCP port 5060, the default port used for SIP communication. When this port is blocked, you cannot make SIPIDO calls. This can in some cases be resolved by choosing SIP transport TLS instead of TCP. TLS has the added benefit that the signaling is encrypted.
My network provider is blocking TCP port 5060
Modified on: Mon, 16 Feb, 2015 at 11:03 AM
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