Dt M F O V Er Di Al; Ca Ll C Le A Rd Ow N - Aeroflex 3900 Series Option Manual

D T MF O ve r d i al
Dur ing a dup lex te lephone call, some mobi les ar e abl e to indicat e D TMF signaling to communicate
wit h au tomate d equi pment co nnected to the PS TN. T his capa bility depends on t he mobi le's
config urat ion a nd may b e a user define d opt ion in the mobile' s sett ings menu .
If enabled , pr essing a ny of t he keys 0 to 9,∗, # on t he mobil e's keypad caus es th ese digi ts to be sent
to t he Test Set which displays, e .g., DT MF :123 456789 ∗0# . The mo bile may be configu red t o indicat e
a DT MF tone fo r as long as the key is pr essed, in w hich case the T est Set sh ows th e d igit in in ve rse
video until the key is r elease d.
C al l C l e ar d o w n
A cal l fr om the Test S et can alw ays be cl eared dow n using the [ Clea rdow n] so ft ke y. It is also ofte n
possible to cl eardo wn a call from the mob ile, dependi ng on the mo bile con figur ation and the t y pe of
call. The metho d fo r cle aring dow n dep ends on the mobile. F or a Mobile Origin ated or Mo bile
Ter m inated Group Ca ll, t he T est S et automat ically cl ears down the call w hen the Cal l H ang T imer
(Tr ansmission Tr unking, Timed or No Tran smi s si on) has expi red.
I f a n a t t em p t i s m a d e t o c l e a r d o w n a M o b i l e T er m i n a t e d G r o u p C a l l f r o m t h e m o b i l e , t h i s d o e s
n o t c l e a r d o w n t h e c a ll o n t h e T e s t S e t , a s t h e m o b i l e d o e s n o t s e n d a n y s i g n a l i n g t o t h e T e s t
S e t i n t h i s c a s e . T h e m o b i l e si m p l y l e a v e s t he T r a f f i c C h a n n e l ( T C H ) a n d r e t u r n t o t h e M C C H .
H o w e v e r , s i n ce t h e T e s t S e t is s t i l l i n C o n v e r s a t i o n M o d e o n t h e T r a f f i c C h a n n e l , t h e m o b i l e
d o e s n o t f i n d t h e M C C H u n t i l t h e [ C l e a r d o w n ] s o f t k e y i s p r e s s e d , w h i c h c a u s e s t h e T e s t S et t o
r e t u r n t o M o d e : M C C H .
T E T R A M S S y s t e m
5-46