Fractional PRI config for MGCP
Fractional PRI with MGCP is not supported. But there is a workaround. To avoid any problems you can busy out channels that are not in use on the Gateway from the ccmadmin pages. This way Callmanager will not try to use channels that are unavailable. This is a workaround.
Here is the bug ID- CSCdw78580
From CCMAdmin pages go to System > Service Parameters > Service
Parameter Configuration > Clusterwide Parameters (Device - PRI and MGCP
Gateway) -> Change B-Channel Maintenance Status 1
B-Channel maintenance status for PRI and CAS interfaces in real time for troubleshooting.
Input Format:
Device Name = B-channel Maintenance Status
Example:
S0/DS1-0@SDA123456789ABC = 0000 1111 0000 0000 0000 0001 (24 bits for T1. Channel number begins with 1 to 24 from left to right.* In the case of PRI, the last bit specifies the D Channel*, which does not get affected. *In this example, the 5th through 8th B-Channels are out of service.*)
or,
S1/DS1-0@DLS2-CM136-VG200-2.SELSIUSCMLAB.CISCO.COM = 0000 0000 0000 0000
0000 0000 1111 1111 (32 bits for E1. B-Channel number begins with 1 to 32 from left to right. The 16th channel specifies the D-Channel. The last bit does not affect any channel. In this example, the 25th through
31st channels are marked out of service.)
Explanation:
*The Device Name as specified in the Gateway Configuration page in Cisco CallManager Administration MUST exactly match the gateway name that this field specifies.* To avoid any manual inputting mistake, copy the Device Name from Cisco CallManager Administration and paste it into this service parameter. "=" is mandatory and unique to distinguish the Device Name and B-Channel Maintenance Status fields.
BCHANNEL MAINTENANCE STATUS = xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx
Where x can be:0 -- In service
1 -- Graceful out of service (Change channel status until active call ends if an active call exists on that channel.)
2 -- Forceful out of service (Tear down active call first; then, change channel status immediately if an active call exists on that channel.)
Because values other than 0,1, or 2 are invalid, the system ignores them. Make sure that the total number of 'x' is either 24 for T1 or 32 for E1. Any other invalid length or mismatch (for example, 24 for E1)
gets treated as error, and no action gets taken for that device.
SPACE: Optional.
The spaces between device name and "=", between '=' and BCHANNEL MAINTENANCE STATUS, and between x and x, are all optional. You cannot use any space inside the DEVICE NAME field.
2. Make sure you will not use it with the CCM config server option as the call manager will reset the B channel service parameter status and overwrite the configuration on the router, so calls will then be attempted on the unconfigured B channels.
Here is the bug ID- CSCdw78580
From CCMAdmin pages go to System > Service Parameters > Service
Parameter Configuration > Clusterwide Parameters (Device - PRI and MGCP
Gateway) -> Change B-Channel Maintenance Status 1
B-Channel maintenance status for PRI and CAS interfaces in real time for troubleshooting.
Input Format:
Device Name = B-channel Maintenance Status
Example:
S0/DS1-0@SDA123456789ABC = 0000 1111 0000 0000 0000 0001 (24 bits for T1. Channel number begins with 1 to 24 from left to right.* In the case of PRI, the last bit specifies the D Channel*, which does not get affected. *In this example, the 5th through 8th B-Channels are out of service.*)
or,
S1/DS1-0@DLS2-CM136-VG200-2.SELSIUSCMLAB.CISCO.COM = 0000 0000 0000 0000
0000 0000 1111 1111 (32 bits for E1. B-Channel number begins with 1 to 32 from left to right. The 16th channel specifies the D-Channel. The last bit does not affect any channel. In this example, the 25th through
31st channels are marked out of service.)
Explanation:
*The Device Name as specified in the Gateway Configuration page in Cisco CallManager Administration MUST exactly match the gateway name that this field specifies.* To avoid any manual inputting mistake, copy the Device Name from Cisco CallManager Administration and paste it into this service parameter. "=" is mandatory and unique to distinguish the Device Name and B-Channel Maintenance Status fields.
BCHANNEL MAINTENANCE STATUS = xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx
Where x can be:0 -- In service
1 -- Graceful out of service (Change channel status until active call ends if an active call exists on that channel.)
2 -- Forceful out of service (Tear down active call first; then, change channel status immediately if an active call exists on that channel.)
Because values other than 0,1, or 2 are invalid, the system ignores them. Make sure that the total number of 'x' is either 24 for T1 or 32 for E1. Any other invalid length or mismatch (for example, 24 for E1)
gets treated as error, and no action gets taken for that device.
SPACE: Optional.
The spaces between device name and "=", between '=' and BCHANNEL MAINTENANCE STATUS, and between x and x, are all optional. You cannot use any space inside the DEVICE NAME field.
2. Make sure you will not use it with the CCM config server option as the call manager will reset the B channel service parameter status and overwrite the configuration on the router, so calls will then be attempted on the unconfigured B channels.
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