Re: [asterisk-users] Call audio leaking between calls
Tilghman Lesher tles...@digium.com writes: Many consumer-grade switches effectively turn into hubs when more than 1023 MAC addresses are seen on a network. This may be done intentionally by somebody attempting to eavesdrop on all network connections sent through the switch. A reboot of the switch might (temporarily) remedy the problem, but you'd be better off getting an enterprise-grade switch that does not exhibit such misbehavior. Even so, all network cards automatically drop all unicast traffic not destined to their mac address (or addresses). This is turned off when the nic is in promiscuous mode, but that shouldn't happen on hardphones. Also, it is highly unlikely that IP stack wouldn't drop the traffic itself. This is simply too basic to get wrong. The only way I can see that a low-layer network problem could cause crosstalk is if two phones somehow acquired the same MAC address. They would likely end up with the same IP as well, and that could certainly cause problems. /Benny ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
Aslamoalikum Ishfaq Can you check this with asterisk 1.6.X ? On Tue, Nov 10, 2009 at 2:45 PM, Ishfaq Malik i...@pack-net.co.uk wrote: Hi Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of their own? We're getting this for the first time and I'm at a bit of a loss as to where to start to look. We're using 1.4.17 Any pointers would be much appreciated! Ish -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Best Regards Shakeel Abbas ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
Hi Not really, all our asterisk servers are 1.4.17 and the issue isn't happening to all our customers, only one subset and I wouldn't even know where to start to replicate the issue as our own office network runs off the same server and we've never had this sort of issue. Ish ABBAS SHAKEEL wrote: Aslamoalikum Ishfaq Can you check this with asterisk 1.6.X ? On Tue, Nov 10, 2009 at 2:45 PM, Ishfaq Malik i...@pack-net.co.uk mailto:i...@pack-net.co.uk wrote: Hi Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of their own? We're getting this for the first time and I'm at a bit of a loss as to where to start to look. We're using 1.4.17 Any pointers would be much appreciated! Ish -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Best Regards Shakeel Abbas ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
Ishfaq Malik wrote: Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of It's called cross talk and yes, we've experienced it. But, it will only happen on an analog network (PSTN). At that point, the provider had to check the analog lines. It eventually was fixed. In a purely SIP environment, you shouldn't see this. Doug -- Ben Franklin quote: Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
Doug Lytle wrote: Ishfaq Malik wrote: Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of It's called cross talk and yes, we've experienced it. But, it will only happen on an analog network (PSTN). At that point, the provider had to check the analog lines. It eventually was fixed. In a purely SIP environment, you shouldn't see this. Doug This is what I'm thinking too and it's a weird one to try to pin down, especially as I've currently got very little information. I think I'm going to use Monitor on all their calls and see if the recordings show any signs of this cross talk but even if they do it still doesn't help to resolve the issue. You'd think it would be an impossibility due to the nature of IP traffic. Ish -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
Ishfaq Malik wrote: You'd think it would be an impossibility due to the nature of IP traffic. I've also read, on this list, that some have had issues with people using speaker phones and the far end picking up conversations in a crowded call center environment. Doug -- Ben Franklin quote: Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
I agree with the cross talk analysis. My suggestion would be to focus your efforts on the analog trunks/stations, not SIP. Are you using twisted pair or shielded cables for your analog runs? If not, you might consider changing the cables or at least increasing the physical distance between them - in my experience this is the most common cause for cross talk. -Original Message- From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Ishfaq Malik Sent: Tuesday, November 10, 2009 7:47 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Call audio leaking between calls Doug Lytle wrote: Ishfaq Malik wrote: Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of It's called cross talk and yes, we've experienced it. But, it will only happen on an analog network (PSTN). At that point, the provider had to check the analog lines. It eventually was fixed. In a purely SIP environment, you shouldn't see this. Doug This is what I'm thinking too and it's a weird one to try to pin down, especially as I've currently got very little information. I think I'm going to use Monitor on all their calls and see if the recordings show any signs of this cross talk but even if they do it still doesn't help to resolve the issue. You'd think it would be an impossibility due to the nature of IP traffic. Ish -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
The analogue part of it is being supplied by an external carrier. If the problem were with them then the cross talk would be able to happen to any of THEIR customers and not just a sub set of ours. But thanks to all for all the ideas and insight, it helps me realise I'm not going potty with my original thoughts... Ish Ryan M. Colbert wrote: I agree with the cross talk analysis. My suggestion would be to focus your efforts on the analog trunks/stations, not SIP. Are you using twisted pair or shielded cables for your analog runs? If not, you might consider changing the cables or at least increasing the physical distance between them - in my experience this is the most common cause for cross talk. -Original Message- From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Ishfaq Malik Sent: Tuesday, November 10, 2009 7:47 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Call audio leaking between calls Doug Lytle wrote: Ishfaq Malik wrote: Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of It's called cross talk and yes, we've experienced it. But, it will only happen on an analog network (PSTN). At that point, the provider had to check the analog lines. It eventually was fixed. In a purely SIP environment, you shouldn't see this. Doug This is what I'm thinking too and it's a weird one to try to pin down, especially as I've currently got very little information. I think I'm going to use Monitor on all their calls and see if the recordings show any signs of this cross talk but even if they do it still doesn't help to resolve the issue. You'd think it would be an impossibility due to the nature of IP traffic. Ish -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
Hi All, getting somewhere with this and thought I'd share it in case anyone else has the same problem. First of all, thanks to Doug who told me it's called cross talk and thus helped me find solutions. This makes interesting reading about the topic http://forums.digium.com/viewtopic.php?t=4048highlight=sid=b0524e2ff689fe6ae3387a5ee6d7d92c Now there is an issue that the SIP device should reject any packets not specifically destined for it but that's a separate issue. Our customer has a switch but a non configurable one which sounds no better than a hub to me, I think I'm going to have to get him to invest in some better hardware. Ish Ryan M. Colbert wrote: I agree with the cross talk analysis. My suggestion would be to focus your efforts on the analog trunks/stations, not SIP. Are you using twisted pair or shielded cables for your analog runs? If not, you might consider changing the cables or at least increasing the physical distance between them - in my experience this is the most common cause for cross talk. -Original Message- From: asterisk-users-boun...@lists.digium.com [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Ishfaq Malik Sent: Tuesday, November 10, 2009 7:47 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Call audio leaking between calls Doug Lytle wrote: Ishfaq Malik wrote: Has anyone ever had experience of phones on the same office network being able to hear other concurrent call's audio whilst on calls of It's called cross talk and yes, we've experienced it. But, it will only happen on an analog network (PSTN). At that point, the provider had to check the analog lines. It eventually was fixed. In a purely SIP environment, you shouldn't see this. Doug This is what I'm thinking too and it's a weird one to try to pin down, especially as I've currently got very little information. I think I'm going to use Monitor on all their calls and see if the recordings show any signs of this cross talk but even if they do it still doesn't help to resolve the issue. You'd think it would be an impossibility due to the nature of IP traffic. Ish -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Ishfaq Malik Software Developer PackNet Ltd Office: 0161 660 3062 ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call audio leaking between calls
On Tuesday 10 November 2009 09:07:30 Ishfaq Malik wrote: Our customer has a switch but a non configurable one which sounds no better than a hub to me, I think I'm going to have to get him to invest in some better hardware. Many consumer-grade switches effectively turn into hubs when more than 1023 MAC addresses are seen on a network. This may be done intentionally by somebody attempting to eavesdrop on all network connections sent through the switch. A reboot of the switch might (temporarily) remedy the problem, but you'd be better off getting an enterprise-grade switch that does not exhibit such misbehavior. -- Tilghman Lesher Digium, Inc. | Senior Software Developer twitter: Corydon76 | IRC: Corydon76-dig (Freenode) Check us out at: www.digium.com www.asterisk.org ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
