我是新的mfcr2-星号，我在尝试通过sip进行sip通话时正面临以下错误。
-- Executing [91000@from-internal:1] Dial("SIP/527-00000001", "DAHDI/G0/1000") in new stack
-- Called G0/1000
New MFC/R2 call detected on chan 27.
[Jul 21 13:13:45] NOTICE[14771]: chan_dahdi.c:1623 dahdi_r2_on_line_blocked: Far end blocked on chan 25
[Jul 21 13:13:53] WARNING[16224]: chan_dahdi.c:1599 dahdi_r2_write_log: Chan 29 - Seize Timeout Expired!
[Jul 21 13:13:53] ERROR[16224]: chan_dahdi.c:1602 dahdi_r2_write_log: Chan 29 - Protocol error. Reason = Seize Timeout, R2 State = Seize Transmitted, MF state = MF Engine Off, MF Group = Forward MF init, CAS = 0x08
DNIS = 1000, ANI = 527, MF = 0x20
[Jul 21 13:13:53] ERROR[16224]: chan_dahdi.c:1374 dahdi_r2_on_protocol_error: MFC/R2 protocol error on chan 29: Seize Timeout
-- Hungup 'DAHDI/29-1'
== Everyone is busy/congested at this time (1:0/0/1)
-- Executing [91000@from-internal:2] Hangup("SIP/527-00000001", "") in new stack
== Spawn extension (from-internal, 91000, 2) exited non-zero on 'SIP/527-00000001'
MFC/R2 call disconnected on chan 27
MFC/R2 call end on chan 27
谢谢。