Hi, What has been your experience in signaling holds to the PSTN? The more everyone converts to SIP and peers with our carriers, the more stacks we see on the far end. A growing number seem to have trouble accepting any kind of hold SDP signals such as a=inactive/sendonly, quad zeros, etc. Is this vexing you too, or is it just me? David This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system.
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In our 3PCC model, the switch is not in a position to do that. It does not control the details of the RTP stream (codec, timestamp, sequence, marker, etc). David From: Paul Timmins [mailto:paul at timmins.net] Sent: Tuesday, April 15, 2014 08:20 To: Hiers, David (DS) Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Signaling hold to the PSTN Shouldn't the local switch just play hold music into the network, and the other side be completely unaware of hold at all? On Tue, 04/15/2014 10:39 AM, "Hiers, David" <David.Hiers at adp.com<mailto:David.Hiers at adp.com>> wrote: Hi, What has been your experience in signaling holds to the PSTN? The more everyone converts to SIP and peers with our carriers, the more stacks we see on the far end. A growing number seem to have trouble accepting any kind of hold SDP signals such as a=inactive/sendonly, quad zeros, etc. Is this vexing you too, or is it just me? David ________________________________ This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org<mailto:VoiceOps at voiceops.org> https://puck.nether.net/mailman/listinfo/voiceops This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system.
Food for thought. I think there's a reasonable argument that the whole magic of the PSTN is the interoperability it's had for decades. This interoperability comes from each switch connecting to it cleaning up whatever messes have been created in userland before handing off a clean signal and audio stream to the rest of the PSTN. I think perhaps model that doesn't does this is a model designed for the Internet, not the PSTN. -jbn On Tue, Apr 15, 2014 at 10:25 AM, Hiers, David <David.Hiers at adp.com> wrote:
In our 3PCC model, the switch is not in a position to do that. It does not control the details of the RTP stream (codec, timestamp, sequence, marker, etc).
David
From: Paul Timmins [mailto:paul at timmins.net] Sent: Tuesday, April 15, 2014 08:20 To: Hiers, David (DS) Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Signaling hold to the PSTN
Shouldn't the local switch just play hold music into the network, and the other side be completely unaware of hold at all?
On Tue, 04/15/2014 10:39 AM, "Hiers, David" <David.Hiers at adp.com> wrote:
Hi,
What has been your experience in signaling holds to the PSTN? The more everyone converts to SIP and peers with our carriers, the more stacks we see on the far end. A growing number seem to have trouble accepting any kind of hold SDP signals such as a=inactive/sendonly, quad zeros, etc.
Is this vexing you too, or is it just me?
David
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SS7 as well as sip allow for remote hold. No media is transmitted at that point in Sip you save bandwidth in TDM you don't eat up a channel -------- Original message -------- From: Paul Timmins Date:04/15/2014 11:20 AM (GMT-05:00) To: David.Hiers at adp.com Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Signaling hold to the PSTN Shouldn't the local switch just play hold music into the network, and the other side be completely unaware of hold at all? On Tue, 04/15/2014 10:39 AM, "Hiers, David" <David.Hiers at adp.com> wrote: Hi, What has been your experience in signaling holds to the PSTN? The more everyone converts to SIP and peers with our carriers, the more stacks we see on the far end. A growing number seem to have trouble accepting any kind of hold SDP signals such as a=inactive/sendonly, quad zeros, etc. Is this vexing you too, or is it just me? David ________________________________ This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org<mailto:VoiceOps at voiceops.org> https://puck.nether.net/mailman/listinfo/voiceops
Peiople get confused when you put them on hold and they hear their own hold music/messages instead of yours. If you are worred about saving 64K of bandwidth then you have far more serious issues than which side plays the hold music.. -----Original Message----- From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Alexander Lopez Sent: Tuesday, April 15, 2014 11:44 AM To: Paul Timmins; David.Hiers at adp.com Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Signaling hold to the PSTN SS7 as well as sip allow for remote hold. No media is transmitted at that point in Sip you save bandwidth in TDM you don't eat up a channel -------- Original message -------- From: Paul Timmins Date:04/15/2014 11:20 AM (GMT-05:00) To: David.Hiers at adp.com Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Signaling hold to the PSTN Shouldn't the local switch just play hold music into the network, and the other side be completely unaware of hold at all? On Tue, 04/15/2014 10:39 AM, "Hiers, David" <David.Hiers at adp.com> wrote: Hi, What has been your experience in signaling holds to the PSTN? The more everyone converts to SIP and peers with our carriers, the more stacks we see on the far end. A growing number seem to have trouble accepting any kind of hold SDP signals such as a=inactive/sendonly, quad zeros, etc. Is this vexing you too, or is it just me? David ________________________________ This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops
----- Original Message -----
From: "Alexander Lopez" <alex.lopez at opsys.com>
SS7 as well as sip allow for remote hold. No media is transmitted at that point in Sip you save bandwidth in TDM you don't eat up a channel
That violates the rules of TDM rather violently. It implies that a perfectly valid working call could *break* in the middle, since the TDM VC it had nailed up would *lose a segment* in the middle, which might then not be available when the user came back. Nuh uh... not in *my* network. Hold is in-band, semantically; it is *not* the province of the transport mechanism. Cheers, -- jra -- Jay R. Ashworth Baylink jra at baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
in my opinion remote hold will be used less and less as things move to packet switched and bandwidth becomes less and less of an issue. Problem being that most people do not understand the standards and would just prefer to configure local hold -------- Original message -------- From: Paul Timmins Date:04/15/2014 11:20 AM (GMT-05:00) To: David.Hiers at adp.com Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] Signaling hold to the PSTN Shouldn't the local switch just play hold music into the network, and the other side be completely unaware of hold at all? On Tue, 04/15/2014 10:39 AM, "Hiers, David" <David.Hiers at adp.com> wrote: Hi, What has been your experience in signaling holds to the PSTN? The more everyone converts to SIP and peers with our carriers, the more stacks we see on the far end. A growing number seem to have trouble accepting any kind of hold SDP signals such as a=inactive/sendonly, quad zeros, etc. Is this vexing you too, or is it just me? David ________________________________ This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org<mailto:VoiceOps at voiceops.org> https://puck.nether.net/mailman/listinfo/voiceops
participants (6)
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alex.lopez＠opsys.com -
David.Hiers＠adp.com -
EWieling＠nyigc.com -
jra＠baylink.com -
justin＠ejtown.org -
paul＠timmins.net