I have an issue with an OS7030 v5.01 where I have 8 SIP trunks and 8 SMT-i6011 telephones. If someone makes a call out, they cannot hear the far end but the far end can hear them. This doesn’t happen on incoming calls, it only happens on the first outgoing call. If there is already a conversation going on a SIP trunk the outgoing call is fine. I’ve had someone call me from the OS7030 and they couldn’t hear me and while that call was on hold call me from 2 other phones on the OS7030 and both of those calls were good. It was installed a little over a month ago and worked fine until this week. I've made sure the ports for mgi and mps are forwarded.

I've checked connection status and mps status while testing calls, it doesn't seem to matter which sip trunk or mps the call is using. Not sure where to look next.

Thanks for any assistance!