Call Forward to external number drops after one ring
I am having an intermittent issue with Call Forward to external numbers on the ISDN PRI (BT). When a call is forwarded the caller continues to hear ringing however the phone the call is forwarded to, only rings once and then disconnects the call.
I have had a look at debugs on the gateway and I can see a disconnect cause of 65, also the issue only seems to happen when the call comes in as 3.1kHz Audio and out as Speech. I have set the voice port to bearer Speech.
REASON: cause code = 65 - Bearer Capability Not Implemented. Indicates that the equipment sending this cause does not support the bearer capability requested (i.e., requesting 64kb data when only speech is supported).
Example: Inbound call
Sending Complete Bearer Capability i = 0x9090A3 Standard = CCITT Transfer Capability = 3.1kHz Audio Transfer Mode = Circuit Transfer Rate = 64 kbit/s Channel ID i = 0xA18381 Preferred, Channel 1 Progress Ind i = 0x8483 - Origination address is non-ISDN Calling Party Number i = 0x2183, '1628XXXXXX' Plan:ISDN, Type:National Called Party Number i = 0x81, '79XXXX' Plan:ISDN, Type:Unknown
Bearer Capability i = 0x8090A3 Standard = CCITT Transfer Capability = Speech Transfer Mode = Circuit Transfer Rate = 64 kbit/s Channel ID i = 0xA98382 Exclusive, Channel 2 Calling Party Number i = 0x0081, '79XXXX' Plan:Unknown, Type:Unknown Called Party Number i = 0x80, '127101628XXXXXX' Plan:Unknown, Type:Unknown
I have asked the service provider but they say it's not them.
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