If the transfer is using SIP REFER, the carrier/switch (equipment that sends call into Asterisk) would be required to support it.
SIP REFER tends to be used with switch vendors as opposed to SIP providers. Not sure if there are any SIP providers who support the REFER feature. Generally, SIP REFER requires SIP Provider or Switch equipment to perform an internal patch/bridge for the 2 parties to hear each other. Dan From: asterisk-dev <asterisk-dev-boun...@lists.digium.com> On Behalf Of John Bittner Sent: Monday, September 12, 2022 12:11 AM To: asterisk-dev@lists.digium.com Subject: [External] [asterisk-dev] Out of the media call forwarding. Hello, Having an issue with call delay and it got more noticeable as more an more customers start to forward there inbound calls to cell phones. Calling from cell to office then transfer to another cell has the most delays. To avoid this I am trying to figure out how to get out of the audio stream and transfer via the carrier. I tried a few options, like asterisk transfer feature that works great from asterisk to asterisk but not directed to a carrier. Do I need to get the carrier to enable a feature to do this ? Anyone know the best way to solve this problem. I have researched this and cant find a solid answer. Is sip redirect the answer ? Any help is much appreciated. John Bittner Xaccel
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