How many channels is your provider allowing you? I remember I had the same problem with asterisk a long time ago and it turned out my provider only allowed 2 channels at a time

On Aug 15, 2012 2:21 AM, "ZhouJianhua" <jh.zhou@outlook.com> wrote:
Hi,

I tried to bridge two PSTN call like this:

  originate sofia/gateway/mygateway/num1 &bridge(sofia/gateway/mygateway/num2)

Two phone ringed but no audio. There is audio if one leg is SIP user, like this:

  originate sofia/internal/1000 &bridge(sofia/gateway/mygateway/num2)

or

   originate sofia/gateway/mygateway/num1 &bridge(sofia/internal/1000)

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