Scenario#29 – Interworking error -0x80FF

I came across this issue with one of  our customer last week where a call was coming in to receptionist at Site ‘A’ but she was not able to transfer the call to someone at Site ‘B’. They had Centralized deployment and all phones on branch sites were registered to Central site. The call was dropping as soon as she would press ‘hold’ to transfer the call. This is what I was getting on Site ‘A’ gateway: 2621-VG01# .Feb  7 09:25:14.805: ISDN Se1/0:15 Q931: RX <- SETUP pd = 8  callref = 0x0002 Sending Complete Bearer Capability i = 0x8090A3 … Continue reading Scenario#29 – Interworking error -0x80FF

Scenario#25 – MoH file download from Call manager

Came across an MoH issue for a customer where the file was missing from Subscriber. As you may be aware that an MoH file should always be uploaded across the cluster on each server to work properly. If you only upload the MoH file on Publisher then it won’t be replicated on other servers. You can check that by going into those servers > Media Resources > Audio Source file. So..to cut long story short, I went back to customer to give me that wave file which was uploaded on Pub so that I can upload it on Sub as … Continue reading Scenario#25 – MoH file download from Call manager

Scenario#24 – SIP Calls drop after Silence

Came across a complex situation where customer was using this SIP trunk as an alternative to ISDN-30 (if all channels are used or if ISDN goes down). The ISDN-30 link was working fine but they had issues on SIP trunk (how many times I have heard this?) …. their outbound calls over SIP were using a prefix ‘8’ to route calls on SIP trunk to SIP Provider. The Outbound calls were working fine. The inbound calls drop after 8 secs and none of the calling/called party could hear each other. Complete silence.. Call flow was something like this: PSTN (81763)  … Continue reading Scenario#24 – SIP Calls drop after Silence

DSP, PVDM & Media Resources

The Cisco High-Density Packet Voice Digital Signal Processor (DSP) Module (PVDM2) enables Cisco Integrated Services Routers to provide high-density voice connectivity, conferencing, and transcoding capabilities in Cisco IP Communications solutions. PVDM stands for packet voice DSP module; it is the Cisco product name for the module that provides digital signal processing resources to a system. DSP stands for Digital Signal Processor; it is a generic Industry terminology. A PVDM module could be staffed with one or multiple DSPs. PVDM2-8 = 8ch (G), 4ch (H), 4ch (M) PVDM2-16 = 16ch (G), 6ch (H), 8ch (M) PVDM2-32 = 32ch (G), 12ch (H), … Continue reading DSP, PVDM & Media Resources

Changing MOH file for CME router

If there is already a MOH file running at the CME router, follow the below steps to change it to a new one. Sh flash: 55        7200 Dec 09 2008 10:53:52 Pulse1.raw 56        4000 Dec 09 2008 10:53:54 Ring1.raw 57        4000 Dec 09 2008 10:53:54 Ring2.raw 58        4000 Dec 09 2008 10:53:54 Ring3.raw 59        4000 Dec 09 2008 10:53:54 Ring4.raw 60        4000 Dec 09 2008 10:53:56 Ring5.raw 61        4000 Dec 09 2008 10:53:56 Ring6.raw 62        4000 Dec 09 2008 10:53:56 Ring7.raw 63         495 Dec 09 2008 10:53:56 RingList.xml 64       10800 Dec 09 2008 10:53:58 Sax1.raw 65       14160 Dec 09 2008 … Continue reading Changing MOH file for CME router

Scanario#8 – New MOH file not working

MOH file uploaded on Pub under MOH Audio source with number # 5. Customer came back saying that he cannot hear the new announcement as per the new file. I tried to select the file under UDP, Phone and even at Service parameter but nothing worked. I could see the file fine at the Publisher. I then ran some RTMT stats and found that Phone is requesting for MOH file but it cannot find it. Why it cannot find it? the file is there at Publisher. I decided to check the Subscibers to see if the file is there as … Continue reading Scanario#8 – New MOH file not working

Uploading MOH file CUCM 4.x

Upload the music file 1:    First have your music file recorded as an 8 Khz, 8 bit, mono ulaw encoded WAV file. 2:    The next step is to get your music file on to the Call Manager server. Copy your music file in to this folder on your call manager server ‘c:\Program Files\Cisco\MOH\DropMOHAudioSourceFilesHere’. When you place your music file in that folder it will disappear after a short while. The Call Manager scans this directory for files and when it finds on it will convert the audio and store it in the Call Manager database. So don’t be concerned when … Continue reading Uploading MOH file CUCM 4.x