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it really does sound like a firewall issue. if the SIP trunk provider doesn't receive the 100 TRYING from their INVITE they will send another. When you ring a DDI this will often present as multiple calls on multiple LA keys. It could be SIP-ALG or possibly the router/SBC is doing PAT on...

I have to say that I agree with you intrigrant. However, I also know that I got into networking because someone took the time to explain a few simple things to me and suddenly what was a "black art" started to make sense. I then started to teach myself the basics, which in turn made me realise...

ah, I really should have read the OP more carefully... [tongue] in that case, how long into the call do they drop? tslytsly, established 1984

I've had issues where SIP trunk to SIP trunk forwards result in no audio. The way to fix that is to make sure you have Keepalives setup on the VOIP tab of the relevant LAN port: tslytsly, established 1984

Completely agree with you derfloh. That's why I was trying to explain what the script was actually doing. I have a text document with all the needed commands on it, just so I don't forget. The script actually misses out some really important things like NTP, SNMP, HTTPS and SSL! tslytsly...

Hi chavz7796 When you use Diversion Header I think the IPO builds the outbound Invite with the original CLI in the From header. Not all SIP companies will allow this. Does your SIP provider allow you to use any CLI on your outbound calls? tslytsly, established 1984

Hi AegisTech Although I agree that if you don't fully understand the options a little bit of training would help, I do feel that you could be given better answers. The important thing to remember is that the 3500 is a Layer 3 switch, so it has a basic router inbuilt. The other thing to...

Sorry. All over a single LAN and my engineer has tested using the Windows app. Tom Sealey Comms Engineer NT Voice & Data

Hi, We're having real trouble with a Flare issue. When people login to Flare after certain amount of time, around 5 mins they get the error: Connectivity to one-X Portal sever has been lost Personal Contacts, Presence and IM are unavailable. If they login again then the presence info etc. all...