3300 with Direct SIP trunk - RTP connection issues one way

[Rixy]

Hi all,

Hoping I can get a few pointers with an intermittent issue I've been experiencing lately.

We currently have a direct SIP trunk configured on our controller, with no MBG at any stage in the path. This has been working for many years with only provider issues arising. However, the last few months have seen an increase in issues with RTP not working for inbound audio once the call connects. However, if I place the call on hold and resume, forcing a new rtp stream, the audio is restored.

What's weird is that I get ring back from the provider when the call is progressing, but as soon as it connects with the far end, the inbound audio is silent.

Running on MCD 7.1 (13.1.0.33). This happens randomly but is slowly getting more and more frequent. Our inbound comes over ISDN (T1 for our non euro friends)

Anyone have any idea's? I thinking network possibly, but I would think this would affect every call if it was.

Cheers

 

[GZgidnick]

Have you rebooted the controller?

 

[bribob]

Anything happening on your firewall that would limit the range of UDP ports that are allowed into your voice subnet?

You say ISDN for incoming, but do you actually mean an E1 data circuit over which your SIP provider is delivering their service?


-b