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Posts Tagged ‘VG224’

SIP and MGCP – Friends or Foes

Informational, Troubleshooting | Posted by admin
Jun 25 2009

Here’s the scenario:  We have a Cisco Unified Communications Manager 6.1, an MGCP controlled VG224, a SIP trunk to the PSTN and hardware transcoders.  We place the SIP trunk and VG224 into different regions so that they should use the g.729 codec.  Transcoders go into a region that will always use g.711.

Symptom : Calls show up on the SIP gateway as g.711, not g.729

This is because the system is using transcoders to complete the call.  The big question is ‘Why?’.  Both devices are natively capable of supporting g.729, but they insist on using a transcoder.  The transcoder sits in a g.711 only region, so both sides of the gateway run g.711.

Here’s the reason why : When calls connect to a SIP trunk in Cisco’s Communications Manager, the system will dynamically allocate a Media Termination Point (MTP) if the two endpoints are configured with incompatible DTMF signalling types.  Since transcoders can be used as MTPs, a transcoding session is invoked.

In many cases VG224s are used to handle Fax calls.  For those who don’t know… Fax machines and transcoders don’t mix.  But even if there are no fax machines in the mix, at remote locations this issue can cause overutilization of bandwidth.

The solution is simple, just make sure that all of your endpoints use compatible DTMF relay methods.

For example in MGCP
mgcp dtmf-relay voip codec all mode nte-ca
is compatible with this command in SIP (RFC-2833)
dtmf-relay rtp-nte

Don’t forget the ATA186

Tips & Tricks | Posted by admin
Jun 08 2009

A big drawback to the previous post is that ATAs cannot be used for fax machines. The reason for this is because the gateway, when sensing a fax tone, immediately moves into T.38 mode. The ATA is unable to handle T.38 and so tries to continue in g.711 mode. Since these two are incompatible, the call will fail.

However, even Cisco recommends that a fax machine be connected to a VG224/VG248 or FXS card connected to a router.  These devices support more than just straight passthrough for fax machines.

VG224 Voltage Levels

Tips & Tricks | Posted by admin
Jun 01 2009

And just like that… it’s 2 weeks have passed.  I can’t believe how much I’ve had to do at home and work.  I really mean to keep this updated daily, but somehow things just make their way on top of the priority list.

This last week we were having issues with some VG224s interoperating with fax machines.  One technician noted that the line voltage was only 38 volts.  Many fax machines, particularly the older ones, and other devices do not work properly or at all with voltages as low as 38.

The fix for this is simple, the following command placed under the voice-port configuration will increase the idle voltage of the VG224 port to a more acceptable level.

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