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Archive for the ‘7.04 Music-on-hold’ Category

Restrictions for Music on Hold

Posted by Andy on May 17, 2009

•IP phones do not support multicast at 224.x.x.x addresses.

•Cisco Unified CME 3.3 and earlier versions do not support MOH for local Cisco Unified CME phones that are on hold with other Cisco Unified CME phones; these parties hear a periodic repeating tone instead.

•Cisco Unified CME 4.0 and later versions support MOH for internal calls only if the multicast moh command is used to enable the flow of packets to the subnet on which the phones are located.

•Internal extensions that are connected through a Cisco VG224 Analog Voice Gateway or through a WAN (remote extensions) do not hear MOH on internal calls.

•Multicast MOH is not supported on a phone if the phone is configured with the mtp command or the paging-dn command with the unicast keyword.

via Cisco Unified Communications Manager Express System Administrator Guide – Configuring Music on Hold  [Cisco Unified Communications Manager Express] – Cisco Systems.

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MOH in CM and CME

Posted by Andy on May 5, 2009

Music on Hold

While Unified CM can be enabled to stream MoH in both G.711 and G.729 formats, Unified CME streams MoH only in G.711 format. Therefore, when Unified CME controls the MoH audio on a call placed on hold, it requires a transcoder to transcode between a G.711 MoH stream and a G.729 call leg.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Call Processing  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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Distributed Multisite Deployments

Posted by Andy on April 22, 2009

Unlike with centralized multisite deployments, in situations where G.711 might be required for MoH audio streams traveling across a WAN, MoH audio streams cannot be forced to G.711 in a distributed multisite deployment. Even when MoH servers are placed in a separate Unified CM region and the G.711 codec is configured between this region and the intercluster or SIP trunk’s region, the codec of the original voice call is maintained when a call between the two clusters is placed on hold by either phone. Because these intercluster calls are typically encoded using G.729 for bandwidth savings, a MoH stream from either cluster will also be encoded using G.729.

Furthermore, multicast MoH is not supported for calls between Unified CM clusters (intercluster calls). Therefore, you must configure at least one unicast MoH resource in each Unified CM cluster if you want MoH on the intercluster or SIP trunk.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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disable multicast moh on wan

Posted by Andy on April 21, 2009

To prevent the central-site audio stream(s) from traversing the WAN, use one of the following methods:

•Configure a maximum hop count

Configure the central-site MoH audio source with a maximum hop count (or TTL) low enough to ensure that it will not stream further than the central-site LAN.

•Configure an access control list (ACL) on the WAN interface

Configure an ACL on the central-site WAN interface to disallow packets destined to the multicast group address(es) from being sent out the interface.

•Disable multicast routing on the WAN interface

Do not configure multicast routing on the WAN interface, thus ensuring that multicast streams are not forwarded into the WAN.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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Lab this

Posted by Andy on April 21, 2009

Beginning with Cisco Unified Survivable Remote Site Telephony (SRST) Release 3.0, MoH can be multicast in a remote or branch site via the branch SRST router’s flash. Beginning with SRST Release 3.2, MoH can be multicast in a branch site via a live feed connected to an analog port on the branch SRST router. Multicast MoH from a branch router via these two methods enhances the Cisco Unified Communications MoH feature in both of the following scenarios:

•Non-Fallback Mode

When the WAN is up and the phones are controlled by Unified CM, this configuration can eliminate the need to forward MoH across the WAN to remote branch sites by providing locally sourced MoH.

•Fallback Mode

When SRST is active and the branch devices have lost connectivity to the central-site Unified CM, the branch router can continue to provide multicast MoH.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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MOH & CAC

Posted by Andy on April 21, 2009

Call admission control for Unified CM (based on either static locations or RSVP-enabled locations) is capable of tracking unicast MoH streams traversing the WAN but not multicast MoH streams. Thus, even if WAN bandwidth has been fully subscribed, a multicast MoH stream will not be denied access to the WAN by call admission control. Instead, the stream will be sent across the WAN, likely resulting in poor audio stream quality and poor quality on all other calls traversing the WAN. To ensure that multicast MoH streams do not cause this over-subscription situation, you should over-provision the QoS configuration on all downstream WAN interfaces by configuring the low-latency queuing (LLQ) voice priority queue with additional bandwidth. Because MoH streams are uni-directional, only the voice priority queues of the downstream interfaces (from the central site to remote sites) must be over-provisioned. Add enough bandwidth for every unique multicast MoH stream that might traverse the WAN link. For example, if there are four unique multicast audio streams that could potentially traverse the WAN, then add 96 kbps to the voice priority queue (4 * 24 kbps per G.729 audio stream = 96 kbps).

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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moh in multisite deployment

Posted by Andy on April 21, 2009

Cisco recommends the use of the G.729 codec for all MoH audio streams traversing the WAN. Because the G.729 codec is optimized for voice and not music applications, you should use G.729 only across the WAN, where the bandwidth savings far outweighs the lower quality afforded by G.729 for MoH transport. Likewise, because multicast traffic provides significant bandwidth savings, you should always use multicast MoH when streaming audio to endpoints across the WAN.

If the sound quality of an MoH stream becomes an issue when using the G.729 codec across the WAN, you can use the G.711 codec for MoH audio streams across the WAN while still using G.729 for voice calls. In order to send MoH streams across the WAN with the G.711 codec but voice calls across the WAN with the G.729 codec, place all MoH servers in a Unified CM region by themselves, and configure that region to use G.711 between itself and all other regions. Thus, when a call is placed between two phones on either side of a WAN, the G.729 codec is used between their respective regions. However, when the call is placed on hold by either party, the MoH audio stream is encoded using G.711 because G.711 is the configured codec to use between the MoH server’s region and the region of the phone placed on hold.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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mph for wireless phones

Posted by Andy on April 21, 2009

wireless IP phones do not support multicast due to the behavior of wireless technology. Thus, when deploying wireless IP phones, you have to configure both multicast and unicast MoH.

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Unicast and Multicast in the Same UCM Cluster

Posted by Andy on April 21, 2009

Use one of the following methods to enable a cluster to support both unicast and multicast MoH audio streams:

•Deploy separate MoH servers, with one server configured as a unicast MoH server and the second server configured as a multicast MoH server.

•Deploy a single MoH server with two media resource groups (MRGs), each containing the same MoH server, with one MRG configured to use multicast for audio streams and the second MRG configured to use unicast.

via Cisco Unified Communications SRND Based on Cisco Unified Communications Manager 7.x – Music on Hold  [Cisco Unified Communications Manager (CallManager)] – Cisco Systems.

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