in general overview , a gmsc receives a request to initiate a call to a ue . the gmsc establishes one or more cap dialogues to implement custom applications on the ue . the ue is in the process of moving from a first msc to a second msc . the ue is transmitting a location update . the first msc sends a rch message to the gmsc . the rch message includes an indicator that mtrr is applicable . the gmsc analyzes a service key of each cap dialogue to selectively determine whether the cap dialogue should be terminated or not . fig1 is block diagram showing an exemplary gsm network 100 including ue 105 , a msc 130 , an equipment identity register ( eir ) 140 , an authorization center ( auc ) 150 , a hlr 160 , a gsm service control function ( gsmscf ) 155 , and a gmsc 170 that interfaces with other public land mobile networks ( plmn ). the gmsc 170 can include a service switching function ( ssf ) ( not shown ). the gsmscf 155 and the ssf are two elements used with camel protocol . the ssf stores camel features that are unique to a particular carrier . the gsmscf 155 contains call processing steps for the camel services . communication between gsm network elements is defined by the 3gpp to enable data , speech , and mobile network technology to converge over an internet protocol ( ip ) based infrastructure . one of ordinary skill in the art can appreciate that the gsm network can include other network elements not shown in fig1 . exemplary camel services include video downloads , music downloads , prepaid service , automated call forwarding , and ring - back tone services . fig2 is a sequence diagram of a gmsc terminating all cap dialogues . a gmsc 170 receives a request ( not shown ) to initiate a call session to a ue 105 . the gmsc 170 queries a hlr 160 for a temporary number ( e . g ., mobile subscriber roaming number ( msrn )) of the ue 105 by transmitting a send routing information ( sri ) message 206 . the sri message includes a reference to the ue 105 , call ref , and indicates that mtrr is supported . the hlr 160 returns an sri acknowledgement ( ack ) message 208 with terminating camel subscription information ( t - csi ). the t - csi identifies camel services that are applicable to the ue 105 . the t - csi includes service keys and a gsmscf address where service logic that corresponds to the service keys reside . the gmsc 170 establishes cap dialogues 210 with a gsmscf 155 . the gmsc 170 queries the hlr 160 with a second request for the temporary number of the ue 105 by transmitting a sri message 214 . the sri message 214 indicates to the hlr 160 not to send a t - csi in the sri ack with a suppress t - csi indicator . the sri message 214 indicates to the hlr 160 that mtrr is supported . the hlr 160 requests the temporary number from a first msc 130 by transmitting a provide roaming number ( prn ) message 218 . the prn message 218 includes the reference to the ue 105 and an indicator that mtrr is implemented . the first msc 130 transmits a prn ack message 220 that includes the temporary number ( msrn ) to the hlr 160 . the hlr 160 transmits an sri ack message 222 including the temporary number to the gmsc 170 . the gmsc 170 forwards an integrated service digital network ( isdn ) user part ( isup ) initial address message ( iam ) message 224 to the first msc 130 . the iam message 224 includes the msrn . the first msc 130 pages the ue 105 by transmitting a paging message 228 to the ue 105 . the ue 105 does not respond to the paging message 228 because the ue 105 has moved from a geographic location served by the first msc 130 to a geographic location served by a second msc 130 ′ during the call initiation request . the ue 105 transmits a location update message 232 to the second msc 130 ′. the second msc 130 ′ informs the hlr 160 that the ue 105 is within its service area by transmitting a location update message 236 to the hlr 160 . the hlr 160 informs the first msc 130 that the ue 105 is no longer in the first msc &# 39 ; s 130 service area by transmitting cancel location message 238 to the first msc 130 . the first msc 130 transmits a cancel location ack message 240 to the hlr 160 . the first msc 130 stops paging the ue 105 and transmits a rch message 246 to the gmsc 170 . the rch message 246 includes the reference to the ue 105 and an indicator that mtrr is implemented . upon receipt of the rch message 246 , the gmsc 170 transmits an rch ack message 246 to the first msc 130 . the gmsc 170 terminates all ongoing cap dialogues 250 . the gmsc 170 releases the call request towards the first msc 130 by transmitting a release ( rel ) message 252 to the first msc 130 . the first msc 130 releases the call request and transmits a release complete ( rlc ) message 254 to the gmsc 170 . the gmsc 170 transmits a new sri message 260 to the hlr 160 . the new sri message 260 does not contain a mtrr indicator . the hlr 160 holds the sri response message 262 until the location update is complete . the hlr 160 transmits an update location ack message 266 to the second msc 130 ′. subsequently , the hlr 160 transmits an sri ack message 268 including t - csi to the gmsc 170 . the gmsc 170 reestablishes the cap dialogues 270 . the gmsc 170 queries the hlr 160 with a second request for the temporary number of the ue 105 by transmitting a sri message 272 . the sri message 272 indicates to the hlr 160 not to send a t - csi in the sri ack with a suppress t - csi indicator . the hlr 160 requests the temporary number from the second msc 130 ′ by transmitting a prn message 274 . the second msc 130 ′ transmits a prn ack message 276 that includes the temporary number ( msrn ) to the hlr 160 . the hlr 160 transmits an sri ack message 278 including the temporary number to the gmsc 170 . the gmsc 170 forwards an isup iam message 280 to the second msc 130 ′. the isup iam message 280 includes the msrn . the second msc 130 ′ pages the ue 105 by transmitting a paging message 282 to the ue 105 . the ue 105 transmits a paging response message 284 to the second msc 130 ′. call delivery is completed by typical call delivery procedures , according to 3gpp standards . as shown above , the gmsc 170 communicates with the two msc &# 39 ; s 130 and 130 ′ via the isup call control protocol . it is apparent to one of ordinary skill in the art that the gmsc 170 can communicate with the two msc &# 39 ; s via any call control protocol . for example , the call control protocol can be bearer independent call control or session initiation protocol ( sip - i ). fig3 is a sequence diagram of a gmsc selectively terminating cap dialogues . the transmission of messages or dialogues in fig3 is substantially the same as the transmission of messages or dialogues transmitted in fig2 until the receipt of the first rch message 246 by the gmsc 170 . for clarity purposes , the message flow is not repeated here . upon receipt of the rch message 246 , the gmsc 170 transmits an rch ack message 248 to the first msc 130 . the gmsc 170 determines whether each cap dialogue should be terminated based on the service key of each cap dialogue . the service key can include an associated control action that indicates whether or not the cap dialogue should be terminated . the service key can be an integer value . the integer value in the service key can identify the service the cap dialogue supports . the control action can be set by an in service provider . the service provider can set the control action by accessing the gmsc 170 . for example , an in service provider can indicate that all audio download cap dialogues should be terminated but ring back tone cap dialogues should not be terminated . the in service provider can indicate the cap dialogues that should be terminated and the cap dialogues that should not be terminated by setting the control action . the control action can be automatically assigned a default value based on the service the cap dialogue supports . the default value can be assigned by the gmsc 170 . for example , the gmsc 170 can always assign control action equal to do not terminate for all ring tone cap dialogues . the gmsc 170 terminates the cap dialogues that it determines should be terminated and does not terminate the cap dialogues that it determines should not be terminated 302 . the gmsc 170 releases the call request towards the first msc 130 by transmitting a rel message 304 to the first msc 130 . the first msc 130 releases the call request and transmits a rlc message 306 to the gmsc 170 . the gmsc 170 transmits a new sri message 310 to the hlr 160 . the new sri message 310 does not contain a mtrr indicator . the hlr 160 holds the sri response message 312 until the location update is complete . the hlr 160 transmits an update location ack message 314 to the second msc 130 ′. then the hlr 160 transmits an sri ack message 318 including t - csi to the gmsc 170 . the gmsc 170 reestablishes the cap dialogues that it terminated , and does not reestablish the cap dialogues that it did not terminate 320 . the gmsc 170 queries the hlr 160 with a second request for the temporary number of the ue 105 by transmitting a sri message 322 . the sri message 272 indicates to the hlr 160 not to send a t - csi in the sri ack with a suppress t - csi indicator . the hlr 160 requests the temporary number from the second msc 130 ′ by transmitting a prn message 324 . the second msc 130 ′ transmits a prn ack message 326 that includes the temporary number ( msrn ) to the hlr 160 . the hlr 160 transmits an sri ack message 328 including the temporary number to the gmsc 170 . the gmsc 170 forwards an isup iam message 330 to the second msc 130 ′. the isup iam message 280 includes the msrn . the second msc 130 ′ pages the ue 105 by transmitting a paging message 332 to the ue 105 . the ue 105 transmits a paging response message 334 to the second msc 130 ′. call delivery is completed by typical call delivery procedures , according to 3gpp standards . whether or not a cap dialogue should be terminated can depend on the service key of other cap dialogues . for example , a first cap dialogue can have a service key equal to 1 , a second cap dialogue can have a service key equal to 2 . the gmsc can terminate the first cap dialogue only if the second cap dialogue has a service key equal to 3 . the gmsc can terminate the second cap dialogue if the first cap dialogue has a service key equal to 1 . in this example , the first cap dialogue is not terminated and the second cap dialogue is terminated . in another example , the first cap dialogue and the second cap dialogue are both terminated . in another example , the first cap dialogue is terminated and the second cap dialogue is not terminated . in another example , the first cap dialogue and the second cap dialogue are terminated . whether or not the cap dialogue should be terminated can depend on the type of camel service the cap dialogue provides . for example , it can be desirable to maintain video downloads , music downloads , prepaid service , automated call forwarding , and ring - back tone services . it can be desirable to terminate prepaid call services and dialing over a virtual private network ( vpn ). the above described techniques can be implemented in a variety of ways . the components of the system can be interconnected by any form or medium of digital data communication ( e . g ., a communication network ). the system can include clients and servers . a client and a server are generally remote from each other and typically interact through a communication network . the relationship of client and server arises by virtue of computer programs running on the respective computers and having a client - server relationship to each other . the above described techniques can be implemented by packet - based networks and / or circuit - based networks . packet - based networks can include , for example , the internet , a carrier internet protocol ( ip ) network ( e . g ., local area network ( lan ), wide area network ( wan ), campus area network ( can ), metropolitan area network ( man ), home area network ( han )), a private ip network , an ip private branch exchange ( ipbx ), a wireless network ( e . g ., radio access network ( ran ), 802 . 11 network , 802 . 16 network , general packet radio service ( gprs ) network , hiperlan ), and / or other packet - based networks . circuit - based networks can include , for example , the public switched telephone network ( pstn ), a private branch exchange ( pbx ), a wireless network ( e . g ., ran , bluetooth , code - division multiple access ( cdma ) network , time division multiple access ( tdma ) network , global system for mobile communications ( gsm ) network ), and / or other circuit - based networks . transmitting devices can include , for example , a computer , a computer with a browser device , a telephone , an ip phone , a mobile device ( e . g ., cellular phone , personal digital assistant ( pda ) device , laptop computer , electronic mail device ), and / or other communication devices . the browser device includes , for example , a computer ( e . g ., desktop computer , laptop computer ) with a world wide web browser ( e . g ., microsoft ® internet explorer ® available from microsoft corporation , mozilla ® firefox available from mozilla corporation ). the mobile computing device includes , for example , a personal digital assistant ( pda ). comprise , include , and / or plural forms of each are open ended and include the listed parts and can include additional parts that are not listed . and / or is open ended and includes one or more of the listed parts and combinations of the listed parts . one skilled in the art can appreciate the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof . the foregoing embodiments are therefore to be considered in all respects illustrative rather than limiting of the invention described herein . scope of the invention is thus indicated by the appended claims , rather than by the foregoing description , and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein .