<p dir="ltr">Hello Drew,</p>
<p dir="ltr">Can you please try removing stcapp register capability command, then give it a try. </p>
<div class="gmail_quote">On 04-Mar-2014 4:14 am, "Drewbles" <<a href="mailto:drewbles80@gmail.com">drewbles80@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi,<div><br></div><div>I have a client that is currently planning a big bang cut over from an Ericsson MD110 to CUCM 9.1. I have recently found out that they have hundreds of modems that are connected to analog lines hanging off the MD110. These are dialled from other internal modems and also external parties calling into the modems directly via DID. During and after the migration to CUCM they will be leaving the modems on the analog lines connected to the MD110 and will be slowly moved over later on.</div>
<div><br></div>
<div>I have configured the gateways for modem passthrough and it seems to be working. I can see some calls switchover (using 'debug voip rtp session named-event' and seeing event 192 & 193) but some other will not negotiate. At the moment calls to and from the MD110 are via two 3925 gateways using multiple E1s to the MD110 and SIP to CUCM. These gateways also provide connectivity to the PSTN. The problems calls are dialling the modems from a modem connected to a VG2XX. The VG224/VG204s are running SCCP.</div>
<div><br></div><div>I can all calls negotiate modem passthrough by looking at the output of 'show call active voice brief' while the modems are negotiating. This is from the terminating gateway (3925) of a failed call:</div>
<div><p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif">0 : 179 -1510115396ms.1 (16:31:39.074 AEST Mon Mar 3 2014) +0 pid:0 Originate connecting</span></p>
<p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif">dur 00:00:28 tx:1409/224504 rx:1408/224344 dscp:0 media:0 audio tos:0xB8 video tos:0x0</span></p>
<p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif">IP <a href="http://172.28.100.1:24898" target="_blank">172.28.100.1:24898</a> SRTP: off rtt:2ms pl:25190/0ms lost:0/0/0 delay:65/65/65ms g711ulaw TextRelay: off Transcoded: No</span></p>
<p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif">media inactive detected:n media contrl rcvd:n/a timestamp:n/a</span></p>
<p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif">long duration call detected:n long duration call duration:n/a timestamp:n/a</span></p>
<p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif">LostPacketRate:0.00 OutOfOrderRate:0.00</span></p>
<p class="MsoNormal" style="font-size:11pt;font-family:Calibri,sans-serif;margin:0cm 0cm 0.0001pt"><span style="font-size:10pt;font-family:Arial,sans-serif"> MODEMPASS nse buf:0/0 loss 0% 0/0 last 2519s dur:0/0s</span></p>
</div><div><br></div><div>For example a call that works is:</div><div>[PSTN modem] --E1--> [3925] --E1--> [MD110] --> [modem] - 100% success rate</div>
<div><br></div><div>If I then dial from a modem connected to a VG204 to the same modem connected to the MD110 it fails. Call flow is:</div><div>[VG204 modem] --SCCP--> [CUCM] --SIP--> [3925] --E1--> [MD110] --> [modem] - 100% failure</div>
<div><br></div><div>However if I dial the PSTN modem in the first example from the VG204 modem the call is successfully:</div><div>[VG204 modem] --SCCP--> [CUCM] --SIP--> [3925] --E1--> [PSTN modem]</div><div><br>
</div><div>I don't have specific dial peers configured on the VG204 or the 3925 gateway configured for fax/modem but I do have the following global commands:</div><div><br></div><div><b>VG204</b></div><div>voice service voip</div>
<div> modem passthrough nee codec g711ulaw</div><div>!</div><div>stcapp register capability 0/0 modem-passthrough<br></div><div><br></div><div><b>3925</b></div><div><div>voice service voip</div><div> fax protocol t38 nse version 0 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw</div>
<div> modem passthrough nee codec g711ulaw</div></div><div><br></div><div>I do have fax relay configured on the 3925 but I have also tried changing it to fax passthrough with no change in the behaviour of the modems calls.</div>
<div><br></div><div>I know it's a big long winded but if anyone can provide feedback or suggestions that would be much appreciated. Happy to provide debugs.</div><div><br></div><div><br></div><div>Cheers,</div><div><br>
</div><div>Drew.</div>
<div><br></div></div>
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