Delayed audio on SIP but not IAX2

General Help
1

Kinda like the thread title says, I’m having a bit of an odd issue with SIP audio being delayed. I’ve got a remote phone registered to the FreePBX box in the customer’s office, and if I call my office phone from the remote phone, there’s no audio for anywhere between 8 and 30 seconds. But if I swap over to an IAX2 extension, and make the same call, I’m able to get audio instantly. And I’m kind of at a loss for ideas.

Personally, I’m tempted to have them setup the remote phones via IAX2 and modify their firewall rules to allow SIP traffic only to/from the carrier.

Any thoughts would be appreciated.

2

I can’t believe the IAX and SIP are taking the same path

3

It’s all pointed at the same IP address, SIP to and from the carrier, SIP to and from the PBX and IAX2 to the PBX. One thing I haven’t yet tried is moving the remote phone SIP traffic to another IP, mostly because I wasn’t (and still am not) necessarily convinced that it’ll make a difference. I can post the NAT rules from their router if you want to see them…